diff --git a/.gitignore b/.gitignore
index 6dd9671..ac13301 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@ python/lasprs/_lasprs*
 .vscode/launch.json
 .vscode
 examples_py/.ipynb_checkpoints
+.ipynb_checkpoints
diff --git a/src/bin/lasp_output.rs b/src/bin/lasp_output.rs
index 2f15841..1c888a4 100644
--- a/src/bin/lasp_output.rs
+++ b/src/bin/lasp_output.rs
@@ -1,10 +1,10 @@
 use anyhow::Result;
-use crossbeam::channel::{ unbounded, Receiver, TryRecvError };
-use lasprs::daq::{ DaqConfig, StreamMgr, StreamStatus, StreamType };
+use crossbeam::channel::{unbounded, Receiver, TryRecvError};
+use lasprs::daq::{DaqConfig, StreamMgr, StreamStatus, StreamType};
 use lasprs::siggen::Siggen;
 use std::io;
 use std::time::Duration;
-use std::{ thread, time };
+use std::{thread, time};
 // use
 
 /// Spawns a thread and waits for a single line, pushes it to the receiver and  returns
@@ -30,13 +30,13 @@ fn main() -> Result<()> {
     let stdin_channel = stdin_channel_wait_for_return();
 
     println!("Creating signal generator...");
-    let mut siggen = Siggen::newSine(2, 432.0);
+    let mut siggen = Siggen::newSine(1., 2, 432.0).unwrap();
 
     // Reduce all gains a bit...
     siggen.setAllGains(0.1);
 
     // Apply signal generator
-    smgr.setSiggen(siggen);
+    smgr.setSiggen(siggen)?;
 
     println!("Starting stream...");
     let devs = smgr.getDeviceInfo();
diff --git a/src/bin/lasp_outputdefault.rs b/src/bin/lasp_outputdefault.rs
index ed17c56..2e258f8 100644
--- a/src/bin/lasp_outputdefault.rs
+++ b/src/bin/lasp_outputdefault.rs
@@ -1,16 +1,15 @@
 use anyhow::Result;
 use crossbeam::channel::{unbounded, Receiver, TryRecvError};
 use lasprs::daq::{StreamMgr, StreamStatus, StreamType};
-use lasprs::siggen::Siggen;
+use lasprs::siggen::{Siggen, SweepType};
 use std::io;
 use std::{thread, time};
 // use
 
 /// Spawns a thread and waits for a single line, pushes it to the receiver and  returns
 fn stdin_channel_wait_for_return() -> Receiver<String> {
-
     let (tx, rx) = unbounded();
-   thread::spawn(move || {
+    thread::spawn(move || {
         let mut buffer = String::new();
         io::stdin().read_line(&mut buffer).unwrap();
         // Do not care whether we succeed here.
@@ -28,7 +27,19 @@ fn main() -> Result<()> {
     let stdin_channel = stdin_channel_wait_for_return();
 
     println!("Creating signal generator...");
-    let mut siggen = Siggen::newSine(2, 432.);
+    // let mut siggen = Siggen::newSine(44100., 2, 432.)?;
+    let mut siggen = Siggen::newSweep(
+        44100.,
+        1,      // nchannels: usize,
+        100.,   // fl: Flt,
+        10000., //fu: Flt,
+        1.0,    // sweep_time: Flt,
+        // 1.0,    //quiet_time: Flt,
+        0.,    //quiet_time: Flt,
+        // SweepType::ForwardLin//sweep_type: SweepType,
+        // SweepType::ForwardLog, //sweep_type: SweepType,
+        SweepType::ContinuousLog, //sweep_type: SweepType,
+    )?;
 
     // Some things that can be done
     // siggen.setDCOffset(&[0.1, 0.]);
@@ -36,12 +47,11 @@ fn main() -> Result<()> {
     // Reduce all gains a bit...
     siggen.setAllGains(0.1);
 
-
     println!("Starting stream...");
     smgr.startDefaultOutputStream()?;
-    
+
     // Apply signal generator
-    smgr.setSiggen(siggen);
+    smgr.setSiggen(siggen)?;
 
     println!("Press <enter> key to quit...");
     'infy: loop {
@@ -52,12 +62,12 @@ fn main() -> Result<()> {
         }
         sleep(100);
         match smgr.getStatus(StreamType::Output) {
-            StreamStatus::NotRunning{} => {
+            StreamStatus::NotRunning {} => {
                 println!("Stream is not running?");
                 break 'infy;
             }
-            StreamStatus::Running{} => {}
-            StreamStatus::Error{e} => {
+            StreamStatus::Running {} => {}
+            StreamStatus::Error { e } => {
                 println!("Stream error: {}", e);
                 break 'infy;
             }
diff --git a/src/daq/streamcmd.rs b/src/daq/streamcmd.rs
index f9f3ef2..b928de1 100644
--- a/src/daq/streamcmd.rs
+++ b/src/daq/streamcmd.rs
@@ -10,6 +10,9 @@ pub enum StreamCommand {
     /// New signal generator config to be used in OUTPUT stream
     NewSiggen(Siggen),
 
+    /// Apply command to the signal generator.
+    SiggenCommand(SiggenCommand),
+
     /// Stop the thread, do not listen for data anymore.
     StopThread,
 
diff --git a/src/daq/streamdata.rs b/src/daq/streamdata.rs
index c5517eb..964a2b9 100644
--- a/src/daq/streamdata.rs
+++ b/src/daq/streamdata.rs
@@ -307,7 +307,7 @@ mod test {
         const Nframes: usize = 20;
         const Nch: usize = 2;
         let mut signal = [0.; Nch * Nframes];
-        let mut siggen = Siggen::newSine(Nch, 1.);
+        let mut siggen = Siggen::newSine(fs, Nch, 1.).unwrap();
 
         siggen.reset(fs);
         siggen.setMute(&[false, true]);
diff --git a/src/daq/streammgr.rs b/src/daq/streammgr.rs
index d79cca9..b5f2324 100644
--- a/src/daq/streammgr.rs
+++ b/src/daq/streammgr.rs
@@ -4,7 +4,7 @@ use crate::{
     config::*,
     siggen::{self, Siggen},
 };
-use anyhow::{bail, Error, Result};
+use anyhow::{anyhow, bail, Error, Result};
 use api::StreamApiDescr;
 use array_init::from_iter;
 use core::time;
@@ -13,8 +13,11 @@ use crossbeam::{
     channel::{unbounded, Receiver, Sender, TrySendError},
     thread,
 };
-use std::sync::{atomic::AtomicBool, Arc, Mutex};
 use std::thread::{JoinHandle, Thread};
+use std::{
+    sync::{atomic::AtomicBool, Arc, Mutex},
+    time::Duration,
+};
 use streamcmd::StreamCommand;
 use streamdata::*;
 use streammetadata::*;
@@ -33,7 +36,8 @@ struct StreamInfo<T> {
     streamtype: StreamType,
     stream: Box<dyn Stream>,
     threadhandle: JoinHandle<T>,
-    comm: Sender<StreamCommand>,
+    commtx: Sender<StreamCommand>,
+    commrx: Receiver<Result<()>>,
 }
 
 /// Keep track of whether the stream has been created. To ensure singleton behaviour.
@@ -108,8 +112,9 @@ impl StreamMgr {
         self.getStatus(st)
     }
     #[pyo3(name = "setSiggen")]
-    fn setSiggen_py(&mut self, siggen: Siggen) {
-        self.setSiggen(siggen)
+    fn setSiggen_py(&mut self, siggen: Siggen) -> PyResult<()> {
+        self.setSiggen(siggen)?;
+        Ok(())
     }
     #[pyo3(name = "getStreamMetaData")]
     fn getStreamMetaData_py(&self, st: StreamType) -> Option<StreamMetaData> {
@@ -195,18 +200,27 @@ impl StreamMgr {
     /// Set a new signal generator. Returns an error if it is unapplicable.
     /// It is unapplicable if the number of channels of output does not match the
     /// number of output channels in a running stream.
-    pub fn setSiggen(&mut self, siggen: Siggen) {
+    pub fn setSiggen(&mut self, siggen: Siggen) -> Result<()> {
         // Current signal generator. Where to place it?
-        if let Some(istream) = &self.input_stream {
+        if let Some(os) = &self.output_stream {
+            assert!(self.siggen.is_none());
+            os.commtx.send(StreamCommand::NewSiggen(siggen)).unwrap();
+            os.commrx.recv().unwrap()
+        } else if let Some(istream) = &self.input_stream {
             if let StreamType::Duplex = istream.streamtype {
                 assert!(self.siggen.is_none());
-                istream.comm.send(StreamCommand::NewSiggen(siggen)).unwrap();
+                istream
+                    .commtx
+                    .send(StreamCommand::NewSiggen(siggen))
+                    .unwrap();
+                istream.commrx.recv().unwrap()
+            } else {
+                self.siggen = Some(siggen);
+                Ok(())
             }
-        } else if let Some(os) = &self.output_stream {
-            assert!(self.siggen.is_none());
-            os.comm.send(StreamCommand::NewSiggen(siggen)).unwrap();
         } else {
             self.siggen = Some(siggen);
+            Ok(())
         }
     }
 
@@ -235,7 +249,7 @@ impl StreamMgr {
     /// of queues that get data from the stream.
     pub fn addInQueue(&mut self, tx: Sender<InStreamMsg>) {
         if let Some(is) = &self.input_stream {
-            is.comm.send(StreamCommand::AddInQueue(tx)).unwrap()
+            is.commtx.send(StreamCommand::AddInQueue(tx)).unwrap()
         } else {
             self.instreamqueues.as_mut().unwrap().push(tx);
         }
@@ -245,8 +259,14 @@ impl StreamMgr {
         &mut self,
         meta: Arc<StreamMetaData>,
         rx: Receiver<InStreamMsg>,
-    ) -> (JoinHandle<InQueues>, Sender<StreamCommand>) {
-        let (commtx, commrx) = unbounded();
+    ) -> (
+        JoinHandle<InQueues>,
+        Sender<StreamCommand>,
+        Receiver<Result<()>>,
+    ) {
+        // Bi-directional communication between input stream thread and stream manager
+        let (commtx_ret, commrx) = unbounded();
+        let (commtx, commrx_ret) = unbounded();
 
         // Unwrap here, as the queues should be free to grab
         let mut iqueues = self
@@ -261,8 +281,17 @@ impl StreamMgr {
                         // New queue added
                         StreamCommand::AddInQueue(queue) => {
                             match queue.send(InStreamMsg::StreamStarted(meta.clone())) {
-                                Ok(()) => iqueues.push(queue),
-                                Err(_) => {}
+                                Ok(()) => {
+                                    iqueues.push(queue);
+                                    commtx.send(Ok(())).unwrap();
+                                }
+                                Err(e) => {
+                                    commtx
+                                        .send(Err(anyhow!(
+                                            "Cannot push to queue: {e}. Object destructed?"
+                                        )))
+                                        .unwrap();
+                                }
                             }
                         }
 
@@ -272,11 +301,15 @@ impl StreamMgr {
                                 &mut iqueues,
                                 InStreamMsg::StreamStopped,
                             );
+                            commtx.send(Ok(())).unwrap();
                             break 'infy;
                         }
                         StreamCommand::NewSiggen(_) => {
                             panic!("Error: signal generator send to input-only stream.");
                         }
+                        StreamCommand::SiggenCommand(_) => {
+                            panic!("Error: signal generator command send to input-only stream.");
+                        }
                     }
                 }
                 if let Ok(msg) = rx.recv_timeout(time::Duration::from_millis(10)) {
@@ -285,7 +318,7 @@ impl StreamMgr {
             }
             iqueues
         });
-        (threadhandle, commtx)
+        (threadhandle, commtx_ret, commrx_ret)
     }
 
     // Match device info struct on given daq config.
@@ -303,8 +336,13 @@ impl StreamMgr {
         &mut self,
         meta: Arc<StreamMetaData>,
         tx: Sender<RawStreamData>,
-    ) -> (JoinHandle<Siggen>, Sender<StreamCommand>) {
-        let (commtx, commrx) = unbounded();
+    ) -> (
+        JoinHandle<Siggen>,
+        Sender<StreamCommand>,
+        Receiver<Result<()>>,
+    ) {
+        let (commtx_res, commrx) = unbounded();
+        let (commtx, commrx_res) = unbounded();
 
         // Number of channels to output for
         let nchannels = meta.nchannels();
@@ -314,7 +352,7 @@ impl StreamMgr {
         let mut siggen = self
             .siggen
             .take()
-            .unwrap_or_else(|| Siggen::newSilence(nchannels));
+            .unwrap_or_else(|| Siggen::newSilence(meta.samplerate, nchannels));
 
         if siggen.nchannels() != nchannels {
             // Updating number of channels
@@ -323,9 +361,15 @@ impl StreamMgr {
         siggen.reset(meta.samplerate);
 
         let threadhandle = std::thread::spawn(move || {
-            let mut floatbuf: Vec<Flt> = Vec::with_capacity(nchannels * meta.framesPerBlock);
+            // What is a good sleep time? We have made sure that there are
+            // two buffers available for the output stream. We choose to wake up twice per frame.
+            let sleep_time_us = Duration::from_micros(
+                (0.5 * 1e6 * meta.framesPerBlock as Flt / meta.samplerate) as u64,
+            );
+
+            let mut floatbuf: Vec<Flt> = vec![0.; nchannels * meta.framesPerBlock];
             'infy: loop {
-                if let Ok(comm_msg) = commrx.try_recv() {
+                if let Ok(comm_msg) = commrx.recv_timeout(sleep_time_us) {
                     match comm_msg {
                         // New queue added
                         StreamCommand::AddInQueue(_) => {
@@ -334,6 +378,7 @@ impl StreamMgr {
 
                         // Stop this thread. Returns the queue
                         StreamCommand::StopThread => {
+                            commtx.send(Ok(())).unwrap();
                             break 'infy;
                         }
                         StreamCommand::NewSiggen(new_siggen) => {
@@ -344,16 +389,20 @@ impl StreamMgr {
                                 // println!("Updating channels");
                                 siggen.setNChannels(nchannels);
                             }
+                            commtx.send(Ok(())).unwrap();
+                        }
+                        StreamCommand::SiggenCommand(cmd) => {
+                            // Apply command to signal generator.
+                            let res = siggen.applyCommand(cmd);
+                            commtx.send(res).unwrap();
                         }
                     }
                 }
                 while tx.len() < 2 {
-                    unsafe {
-                        floatbuf.set_len(nchannels * meta.framesPerBlock);
-                    }
-                    // Obtain signal
+                    // Obtain signal from signal generator
                     siggen.genSignal(&mut floatbuf);
-                    // println!("level: {}", floatbuf.iter().sum::<Flt>());
+
+                    // Convert signal generator data to raw data and push to the stream thread
                     let msg = match meta.rawDatatype {
                         DataType::I8 => {
                             let v = Vec::<i8>::from_iter(floatbuf.iter().map(|f| f.to_sample()));
@@ -377,14 +426,17 @@ impl StreamMgr {
                         }
                     };
                     if let Err(_e) = tx.send(msg) {
-                        // println!("Error sending raw stream data to output stream!");
-                        break 'infy;
+                        // An error occured while trying to send the raw data to
+                        // the stream. This might be because the stream has
+                        // stopped or has an error.
+
+                        // There is nothing we can do here, but we should not stop the thread.
                     }
                 }
             }
             siggen
         });
-        (threadhandle, commtx)
+        (threadhandle, commtx_res, commrx_res)
     }
 
     /// Start a stream of certain type, using given configuration
@@ -418,13 +470,14 @@ impl StreamMgr {
             _ => bail!("API {} not implemented!", cfg.api),
         };
         let meta = stream.metadata();
-        let (threadhandle, commtx) = self.startOuputStreamThread(meta, tx);
+        let (threadhandle, commtx, commrx) = self.startOuputStreamThread(meta, tx);
 
         self.output_stream = Some(StreamInfo {
             streamtype: StreamType::Input,
             stream,
             threadhandle,
-            comm: commtx,
+            commtx,
+            commrx,
         });
 
         Ok(())
@@ -472,13 +525,14 @@ impl StreamMgr {
 
         sendMsgToAllQueuesRemoveUnused(iqueues, InStreamMsg::StreamStarted(meta.clone()));
 
-        let (threadhandle, commtx) = self.startInputStreamThread(meta, rx);
+        let (threadhandle, commtx, commrx) = self.startInputStreamThread(meta, rx);
 
         self.input_stream = Some(StreamInfo {
             streamtype: stype,
             stream,
             threadhandle,
-            comm: commtx,
+            commtx,
+            commrx,
         });
 
         Ok(())
@@ -503,13 +557,14 @@ impl StreamMgr {
         let meta = stream.metadata();
         sendMsgToAllQueuesRemoveUnused(iqueues, InStreamMsg::StreamStarted(meta.clone()));
 
-        let (threadhandle, commtx) = self.startInputStreamThread(meta, rx);
+        let (threadhandle, commtx, commrx) = self.startInputStreamThread(meta, rx);
 
         self.input_stream = Some(StreamInfo {
             streamtype: StreamType::Input,
             stream,
             threadhandle,
-            comm: commtx,
+            commtx,
+            commrx,
         });
         Ok(())
 
@@ -537,15 +592,14 @@ impl StreamMgr {
         let (tx, rx)= unbounded();
         let stream = self.cpal_api.startDefaultOutputStream(rx)?;
         let meta = stream.metadata();
-        let (threadhandle, commtx) = self.startOuputStreamThread(meta, tx);
-                // Inform all listeners of new stream data
-
+        let (threadhandle, commtx, commrx) = self.startOuputStreamThread(meta, tx);
 
         self.output_stream = Some(StreamInfo {
             streamtype: StreamType::Input,
             stream,
             threadhandle,
-            comm: commtx,
+            commtx,
+            commrx,
         });
         Ok(())
 
@@ -563,19 +617,22 @@ impl StreamMgr {
             streamtype: _, // Ignored here
             stream: _,
             threadhandle,
-            comm,
+            commtx,
+            commrx,
         }) = self.input_stream.take()
         {
             // println!("Stopping existing stream..");
             // Send thread to stop
-            comm.send(StreamCommand::StopThread).unwrap();
+            commtx.send(StreamCommand::StopThread).unwrap();
 
             // Store stream queues back into StreamMgr
             self.instreamqueues = Some(threadhandle.join().expect("Stream thread panicked!"));
+
+            let res = commrx.recv().unwrap();
+            return res;
         } else {
             bail!("Stream is not running.")
         }
-        Ok(())
     }
     /// Stop existing output stream
     pub fn stopOutputStream(&mut self) -> Result<()> {
@@ -583,21 +640,17 @@ impl StreamMgr {
             streamtype: _, // Ignored here
             stream: _,
             threadhandle,
-            comm,
+            commtx,
+            commrx,
         }) = self.output_stream.take()
         {
-            if comm.send(StreamCommand::StopThread).is_err() {
-                // Failed to send command over channel. This means the thread is
-                // already finished due to some other reason.
-                assert!(threadhandle.is_finished());
-            }
-            // println!("Wainting for threadhandle to join...");
+            commtx.send(StreamCommand::StopThread).unwrap();
+            // eprintln!("Wainting for threadhandle to join...");
             self.siggen = Some(threadhandle.join().expect("Output thread panicked!"));
-            // println!("Threadhandle joined!");
+            commrx.recv().unwrap()
         } else {
             bail!("Stream is not running.");
         }
-        Ok(())
     }
     /// Stop existing running stream.
     ///
diff --git a/src/ps/timebuffer.rs b/src/ps/timebuffer.rs
index 6e620f2..83e8d1c 100644
--- a/src/ps/timebuffer.rs
+++ b/src/ps/timebuffer.rs
@@ -8,7 +8,7 @@ use std::collections::VecDeque;
 /// TimeBuffer, storage to add blocks of data in a ring buffer, that can be
 /// extracted by blocks of other size. Also, we can keep samples in a buffer to
 /// create, for example, overlapping windows of time data.
-#[derive(Default, Debug)]
+#[derive(Default, Debug, Clone)]
 pub struct TimeBuffer {
     data: Vec<VecDeque<Flt>>,
 }
diff --git a/src/siggen/mod.rs b/src/siggen/mod.rs
index 6236ad6..d144d1a 100644
--- a/src/siggen/mod.rs
+++ b/src/siggen/mod.rs
@@ -21,6 +21,11 @@
 //!
 //! ```
 mod siggen;
+mod siggenchannel;
 mod source;
-pub use source::{Silence, Sine, WhiteNoise};
+mod siggencmd;
+mod sweep;
+pub use source::Source;
 pub use siggen::Siggen;
+pub use sweep::SweepType;
+pub use siggencmd::SiggenCommand;
\ No newline at end of file
diff --git a/src/siggen/siggen.rs b/src/siggen/siggen.rs
index 62fe5ec..6854bdf 100644
--- a/src/siggen/siggen.rs
+++ b/src/siggen/siggen.rs
@@ -1,26 +1,30 @@
+use super::siggenchannel::SiggenChannelConfig;
+use super::SiggenCommand;
+use super::source::{self, *};
+use super::sweep::SweepType;
 use crate::config::*;
 use crate::filter::Filter;
-use super::source::*;
+use anyhow::{bail, Result};
 use dasp_sample::{FromSample, Sample};
 use rayon::prelude::*;
 use std::fmt::Debug;
 use std::iter::ExactSizeIterator;
 use std::slice::IterMut;
 
-
-
-/// Signal generator. Able to create acoustic output signals. See above example on how to use.
+/// Multiple channel signal generator. Able to create (acoustic) output signals. See above example on how to use.
 /// Typical signal that can be created are:
 ///
-/// * (Siggen::newWhiteNoise)
-/// * (Siggen::newSine)
+/// * [Siggen::newWhiteNoise]
+/// * [Siggen::newSine]
+/// * [Siggen::newSilence]
 ///
 #[derive(Clone)]
 #[cfg_attr(feature = "python-bindings", pyclass)]
 pub struct Siggen {
     // The source dynamic signal. Noise, a sine wave, sweep, etc
-    source: Box<dyn Source>,
-    // Filter applied to the source signal
+    source: Source,
+
+    // Channel configuration for each output channel
     channels: Vec<SiggenChannelConfig>,
 
     // Temporary source signal buffer
@@ -34,40 +38,117 @@ pub struct Siggen {
 impl Siggen {
     #[pyo3(name = "newWhiteNoise")]
     #[staticmethod]
-    fn newWhiteNoise_py() -> Siggen {
-        Siggen::newWhiteNoise(0)
+    fn newWhiteNoise_py(fs: Flt) -> Siggen {
+        Siggen::newWhiteNoise(fs, 0)
     }
     #[pyo3(name = "newSine")]
     #[staticmethod]
-    fn newSine_py(freq: Flt) -> Siggen {
-        Siggen::newSine(0, freq)
+    fn newSine_py(fs: Flt, freq: Flt, nchannels: usize) -> PyResult<Siggen> {
+        Ok(Siggen::newSine(fs, nchannels, freq)?)
     }
 }
 
-/// Multiple channel signal generator. Can use a single source (coherent) to provide multiple signals
-/// that can be sent out through different EQ's
 impl Siggen {
+    /// Create a new signal generator with an arbitrary source.
+    /// # Args
+    ///
+    /// - `nchannels` - The number of channels to output
+    /// - `source` - Source function
+    pub fn new(nchannels: usize, source: Source) -> Siggen {
+        Siggen {
+            source,
+            channels: vec![SiggenChannelConfig::new(); nchannels],
+            source_buf: vec![],
+            chout_buf: vec![],
+        }
+    }
+    /// Create sine sweep signal generator
+    ///
+    /// # Args
+    ///
+    /// - `fs` - Sample rate \[Hz\]
+    /// - `nchannels`: The number of channels to output
+    /// - `fl` - Lower frequency \[Hz\]
+    /// - `fu` - Upper frequency \[Hz\]
+    /// - `sweep_time` - The duration of a single sweep \[s\]
+    /// - `quiet_time` - Time of silence after one sweep and start of the next \[s\]
+    /// - `sweep_type` - The type of the sweep, see [SweepType].
+    pub fn newSweep(
+        fs: Flt,
+        nchannels: usize,
+        fl: Flt,
+        fu: Flt,
+        sweep_time: Flt,
+        quiet_time: Flt,
+        sweep_type: SweepType,
+    ) -> Result<Self> {
+        let source = Source::newSweep(fs, fl, fu, sweep_time, quiet_time, sweep_type)?;
+        Ok(Self::new(nchannels, source))
+    }
+    /// Create a sine wave signal generator
+    ///
+    /// # Args
+    ///
+    /// - `fs` - Sampling frequency \[Hz\]
+    /// - `nchannels`: The number of channels to output
+    /// * `freq` - Frequency of the sine wave in \[Hz\]
+    pub fn newSine(fs: Flt, nchannels: usize, freq: Flt) -> Result<Siggen> {
+        Ok(Siggen::new(nchannels, Source::newSine(fs, freq)?))
+    }
+
+    /// Silence: create a signal generator that does not output any dynamic
+    /// signal at all.
+    /// # Args
+    ///
+    /// - `fs` - Sampling frequency \[Hz\]
+    /// - `nchannels` - The number of channels to output
+    pub fn newSilence(_fs: Flt, nchannels: usize) -> Siggen {
+        Siggen::new(nchannels, Source::newSilence())
+    }
+
+    /// Create a white noise signal generator.
+    ///
+    /// # Args
+    ///
+    /// - `fs` - Sampling frequency \[Hz\]
+    /// - `nchannels` - The number of channels to output
+    pub fn newWhiteNoise(_fs: Flt, nchannels: usize) -> Siggen {
+        Siggen::new(nchannels, Source::newWhiteNoise())
+    }
+
     /// Returns the number of channels this signal generator is generating for.
     pub fn nchannels(&self) -> usize {
         self.channels.len()
     }
 
-    /// Silence: create a signal generator that does not output any dynamic
-    /// signal at all.
-    pub fn newSilence(nchannels: usize) -> Siggen {
-        Siggen {
-            channels: vec![SiggenChannelConfig::new(); nchannels],
-            source: Box::new(Silence {}),
-            source_buf: vec![],
-            chout_buf: vec![],
+    /// Apply command to current signal generator to change its state.
+    pub fn applyCommand(&mut self, msg: SiggenCommand) -> Result<()> {
+        match msg {
+            SiggenCommand::ChangeSource { src } => {
+                self.source = src;
+                Ok(())
+            }
+            SiggenCommand::ResetSiggen { fs } => {
+                self.reset(fs);
+                Ok(())
+            }
+            SiggenCommand::SetMuteAllChannels { mute } => {
+                self.setAllMute(mute);
+                Ok(())
+            }
+            SiggenCommand::SetMuteChannel { ch, mute } => {
+                if ch > self.channels.len() {
+                    bail!("Invalid channel index: {ch}");
+                }
+                self.channels[ch].setMute(mute);
+                Ok(())
+            }
+            SiggenCommand::SetAllGains { g } => {
+                self.setAllGains(g);
+                Ok(())
+            }
         }
     }
-
-    /// Create a white noise signal generator.
-    pub fn newWhiteNoise(nchannels: usize) -> Siggen {
-        Siggen::new(nchannels, Box::new(WhiteNoise::new()))
-    }
-
     /// Set gains of all channels in signal generator to the same value
     ///
     /// # Args
@@ -97,23 +178,6 @@ impl Siggen {
         });
     }
 
-    /// Create a sine wave signal generator
-    ///
-    /// * freq: Frequency of the sine wave in \[Hz\]
-    pub fn newSine(nchannels: usize, freq: Flt) -> Siggen {
-        Siggen::new(nchannels, Box::new(Sine::new(freq)))
-    }
-
-    /// Create a new signal generator wiht an arbitrary source.
-    pub fn new(nchannels: usize, source: Box<dyn Source>) -> Siggen {
-        Siggen {
-            source,
-            channels: vec![SiggenChannelConfig::new(); nchannels],
-            source_buf: vec![],
-            chout_buf: vec![],
-        }
-    }
-
     /// Creates *interleaved* output signal
     pub fn genSignal<T>(&mut self, out: &mut [T])
     where
@@ -181,83 +245,6 @@ impl Siggen {
     }
 }
 
-/// Signal generator config for a certain channel
-#[derive(Clone)]
-struct SiggenChannelConfig {
-    muted: bool,
-    prefilter: Option<Box<dyn Filter>>,
-    gain: Flt,
-    DCOffset: Flt,
-}
-unsafe impl Send for SiggenChannelConfig {}
-impl SiggenChannelConfig {
-    /// Set new pre-filter that filters the source signal
-    pub fn setPreFilter(&mut self, pref: Option<Box<dyn Filter>>) {
-        self.prefilter = pref;
-    }
-    /// Set the gain applied to the source signal
-    ///
-    /// * g: Gain value. Can be any float. If set to 0.0, the source is effectively muted. Only
-    /// using (setMute) is a more efficient way to do this.
-    pub fn setGain(&mut self, g: Flt) {
-        self.gain = g;
-    }
-
-    /// Reset signal channel config. Only resets the prefilter state
-    pub fn reset(&mut self, _fs: Flt) {
-        if let Some(f) = &mut self.prefilter {
-            f.reset()
-        }
-    }
-    /// Generate new channel configuration using 'arbitrary' initial config: muted false, gain 1.0, DC offset 0.
-    /// and no prefilter
-    pub fn new() -> SiggenChannelConfig {
-        SiggenChannelConfig {
-            muted: false,
-            prefilter: None,
-            gain: 1.0,
-            DCOffset: 0.0,
-        }
-    }
-
-    /// Set mute on channel. If true, only DC signal offset is outputed from (SiggenChannelConfig::transform).
-    pub fn setMute(&mut self, mute: bool) {
-        self.muted = mute;
-    }
-    /// Generate new signal data, given input source data.
-    ///
-    /// # Args
-    ///
-    /// source: Input source signal.
-    /// result: Reference of array of float values to be filled with signal data.
-    ///
-    /// # Details
-    ///
-    /// - When muted, the DC offset is still applied
-    /// - The order of the generation is:
-    ///     - If a prefilter is installed, this pre-filter is applied to the source signal.
-    ///     - Gain is applied.
-    ///     - Offset is applied (thus, no gain is applied to the DC offset).
-    ///
-    pub fn genSignal(&mut self, source: &[Flt], result: &mut [Flt]) {
-        if self.muted {
-            result.iter_mut().for_each(|x| {
-                *x = 0.0;
-            });
-        } else {
-            result.copy_from_slice(source);
-            if let Some(f) = &mut self.prefilter {
-                f.filter(result);
-            }
-        }
-        result.iter_mut().for_each(|x| {
-            // First apply gain, then offset
-            *x *= self.gain;
-            *x += self.DCOffset;
-        });
-    }
-}
-
 #[cfg(test)]
 mod test {
     use approx::assert_abs_diff_eq;
@@ -269,7 +256,7 @@ mod test {
     fn test_whitenoise() {
         // This code is just to check syntax. We should really be listening to these outputs.
         let mut t = [0.0; 10];
-        Siggen::newWhiteNoise(1).genSignal(&mut t);
+        Siggen::newWhiteNoise(1., 1).genSignal(&mut t);
         // println!("{:?}", &t);
     }
 
@@ -280,7 +267,7 @@ mod test {
         const N: usize = 10000;
         let mut s1 = [0.0; N];
         let mut s2 = [0.0; N];
-        let mut siggen = Siggen::newSine(1, 1.0);
+        let mut siggen = Siggen::newSine(1., 1, 1.0).unwrap();
 
         siggen.reset(10.0);
         siggen.setAllMute(false);
@@ -305,7 +292,7 @@ mod test {
         const Nframes: usize = 10000;
         const Nch: usize = 2;
         let mut signal = [0.0; Nch * Nframes];
-        let mut siggen = Siggen::newSine(Nch, 1.0);
+        let mut siggen = Siggen::newSine(fs, Nch, 1.0).unwrap();
 
         siggen.reset(fs);
         siggen.setMute(&[false, true]);
@@ -327,7 +314,7 @@ mod test {
             .sum::<Flt>()
             / (Nframes as Flt);
 
-        assert_abs_diff_eq!(Flt::abs(ms1 - 0.5) , 0., epsilon= Flt::EPSILON * 1e3);
+        assert_abs_diff_eq!(Flt::abs(ms1 - 0.5), 0., epsilon = Flt::EPSILON * 1e3);
         assert_eq!(ms2, 0.0);
     }
 
diff --git a/src/siggen/siggenchannel.rs b/src/siggen/siggenchannel.rs
new file mode 100644
index 0000000..64c03ef
--- /dev/null
+++ b/src/siggen/siggenchannel.rs
@@ -0,0 +1,78 @@
+use crate::config::*;
+use crate::filter::Filter;
+/// Signal generator config for a certain channel
+#[derive(Clone)]
+pub struct SiggenChannelConfig {
+    muted: bool,
+    prefilter: Option<Box<dyn Filter>>,
+    gain: Flt,
+    pub DCOffset: Flt,
+}
+unsafe impl Send for SiggenChannelConfig {}
+impl SiggenChannelConfig {
+    /// Set new pre-filter that filters the source signal
+    pub fn setPreFilter(&mut self, pref: Option<Box<dyn Filter>>) {
+        self.prefilter = pref;
+    }
+    /// Set the gain applied to the source signal
+    ///
+    /// * g: Gain value. Can be any float. If set to 0.0, the source is effectively muted. Only
+    /// using (setMute) is a more efficient way to do this.
+    pub fn setGain(&mut self, g: Flt) {
+        self.gain = g;
+    }
+
+    /// Reset signal channel config. Only resets the prefilter state
+    pub fn reset(&mut self, _fs: Flt) {
+        if let Some(f) = &mut self.prefilter {
+            f.reset()
+        }
+    }
+    /// Generate new channel configuration using 'arbitrary' initial config: muted false, gain 1.0, DC offset 0.
+    /// and no prefilter
+    pub fn new() -> SiggenChannelConfig {
+        SiggenChannelConfig {
+            muted: false,
+            prefilter: None,
+            gain: 1.0,
+            DCOffset: 0.0,
+        }
+    }
+
+    /// Set mute on channel. If true, only DC signal offset is outputed from (SiggenChannelConfig::transform).
+    pub fn setMute(&mut self, mute: bool) {
+        self.muted = mute;
+    }
+    /// Generate new signal data, given input source data.
+    ///
+    /// # Args
+    ///
+    /// source: Input source signal.
+    /// result: Reference of array of float values to be filled with signal data.
+    ///
+    /// # Details
+    ///
+    /// - When muted, the DC offset is still applied
+    /// - The order of the generation is:
+    ///     - If a prefilter is installed, this pre-filter is applied to the source signal.
+    ///     - Gain is applied.
+    ///     - Offset is applied (thus, no gain is applied to the DC offset).
+    ///
+    pub fn genSignal(&mut self, source: &[Flt], result: &mut [Flt]) {
+        if self.muted {
+            result.iter_mut().for_each(|x| {
+                *x = 0.0;
+            });
+        } else {
+            result.copy_from_slice(source);
+            if let Some(f) = &mut self.prefilter {
+                f.filter(result);
+            }
+        }
+        result.iter_mut().for_each(|x| {
+            // First apply gain, then offset
+            *x *= self.gain;
+            *x += self.DCOffset;
+        });
+    }
+}
diff --git a/src/siggen/siggencmd.rs b/src/siggen/siggencmd.rs
new file mode 100644
index 0000000..8d74287
--- /dev/null
+++ b/src/siggen/siggencmd.rs
@@ -0,0 +1,38 @@
+use super::source::*;
+use crate::config::*;
+
+/// Messages that can be send to a given signal generator [Siggen], to change its behaviour
+
+#[cfg_attr(feature = "python-bindings", pyclass)]
+pub enum SiggenCommand {
+    /// Change the source to a sine wave with given frequency.
+    ChangeSource{
+        /// New signal source to apply for signal generator
+        src: Source,
+    },
+
+    /// Reset the signal generator state
+    ResetSiggen {
+        /// New sampling frequency \[Hz\]
+        fs: Flt,
+    },
+
+    /// Set all gains to value g
+    SetAllGains {
+        /// Linear gain level to apply
+        g: Flt,
+    },
+
+    /// Change the mute state for a certain channel
+    SetMuteChannel {
+        /// channel index
+        ch: usize,
+        /// mute state
+        mute: bool,
+    },
+    /// Change the mute state for all channels
+    SetMuteAllChannels {
+        /// mute state
+        mute: bool,
+    },
+}
diff --git a/src/siggen/source.rs b/src/siggen/source.rs
index 65f2a12..3917e62 100644
--- a/src/siggen/source.rs
+++ b/src/siggen/source.rs
@@ -1,64 +1,107 @@
+//! All sources for a signal generator. Sine waves, sweeps, noise, etc.
+use super::sweep::{SweepParams, SweepType};
 use crate::config::*;
+use std::ops::{Deref, DerefMut};
+
+/// Ratio between circumference and radius of a circle
+const twopi: Flt = 2.0 * pi;
+use crate::config::*;
+use anyhow::{bail, Result};
 use rand::prelude::*;
 use rand::rngs::ThreadRng;
 use rand_distr::StandardNormal;
 
-/// Ratio between circumference and radius of a circle
-const twopi: Flt = 2.0 * pi;
-
-/// Source for the signal generator. Implementations are sine waves, sweeps, noise.
-pub trait Source: Send {
-    /// Generate the 'pure' source signal. Output is placed inside the `sig` argument.
-    fn genSignal_unscaled(&mut self, sig: &mut dyn ExactSizeIterator<Item = &mut Flt>);
-    /// Reset the source state, i.e. set phase to 0, etc
-    fn reset(&mut self, fs: Flt);
-    /// Used to make the Siggen struct cloneable
-    fn clone_dyn(&self) -> Box<dyn Source>;
+/// Signal source for a signal generator. A signal source is capable of creating
+/// new signal data.
+#[cfg_attr(feature = "python-bindings", pyclass)]
+#[derive(Clone)]
+pub struct Source {
+    src: Box<dyn SourceImpl>,
 }
-impl Clone for Box<dyn Source> {
-    fn clone(&self) -> Self {
-        self.clone_dyn()
+impl Source {
+    /// Create a sine wave signal source
+    ///
+    /// # Args
+    ///
+    /// - `fs` - Sampling frequency \[Hz\]
+    /// * `freq` - Frequency of the sine wave in \[Hz\]
+    pub fn newSine(fs: Flt, freq: Flt) -> Result<Source> {
+        Ok(Source {
+            src: Box::new(Sine::new(fs, freq)?),
+        })
+    }
+    /// Silence: create a signal source that does not output any dynamic
+    /// signal at all.
+    pub fn newSilence() -> Source {
+        Source {
+            src: Box::new(Silence {}),
+        }
+    }
+
+    /// Create a white noise signal source
+    pub fn newWhiteNoise() -> Source {
+        Source {
+            src: Box::new(WhiteNoise {}),
+        }
+    }
+
+    /// Sine sweep source
+    ///
+    /// # Args
+    ///
+    /// - `fs` - Sample rate \[Hz\]
+    /// - `fl` - Lower frequency \[Hz\]
+    /// - `fu` - Upper frequency \[Hz\]
+    /// - `sweep_time` - The duration of a single sweep \[s\]
+    /// - `quiet_time` - Time of silence after one sweep and start of the next \[s\]
+    /// - `sweep_type` - The type of the sweep, see [SweepType].
+    pub fn newSweep(
+        fs: Flt,
+        fl: Flt,
+        fu: Flt,
+        sweep_time: Flt,
+        quiet_time: Flt,
+        sweep_type: SweepType,
+    ) -> Result<Source> {
+        Ok(Source {
+            src: Box::new(Sweep::new(fs, fl, fu, sweep_time, quiet_time, sweep_type)?),
+        })
     }
 }
 
 #[derive(Clone)]
-pub struct Silence {}
+/// Silence source. Most simple one does only send out a 0.
+struct Silence {}
 
-impl Source for Silence {
+impl SourceImpl for Silence {
     fn genSignal_unscaled(&mut self, sig: &mut dyn ExactSizeIterator<Item = &mut Flt>) {
         sig.for_each(|s| {
             *s = 0.0;
         });
     }
     fn reset(&mut self, _fs: Flt) {}
-    fn clone_dyn(&self) -> Box<dyn Source> {
+    fn clone_dyn(&self) -> Box<dyn SourceImpl> {
         Box::new(self.clone())
     }
 }
-/// White noise source
+/// White noise source. Can be colored by applying a color filter to the source
 #[derive(Clone)]
-pub struct WhiteNoise {}
-impl WhiteNoise {
-    /// Generate new WhiteNoise generator
-    pub fn new() -> WhiteNoise {
-        WhiteNoise {}
-    }
-}
-impl Source for WhiteNoise {
+struct WhiteNoise {}
+impl SourceImpl for WhiteNoise {
     fn genSignal_unscaled(&mut self, sig: &mut dyn ExactSizeIterator<Item = &mut Flt>) {
         sig.for_each(|s| {
             *s = thread_rng().sample(StandardNormal);
         });
     }
     fn reset(&mut self, _fs: Flt) {}
-    fn clone_dyn(&self) -> Box<dyn Source> {
+    fn clone_dyn(&self) -> Box<dyn SourceImpl> {
         Box::new(self.clone())
     }
 }
 
 /// Sine wave, with configurable frequency
 #[derive(Clone)]
-pub struct Sine {
+struct Sine {
     // Sampling freq \[Hz\]
     fs: Flt,
     // current stored phase
@@ -73,15 +116,22 @@ impl Sine {
     ///
     /// * fs: Sampling freq [Hz]
     /// *
-    pub fn new(freq: Flt) -> Sine {
-        Sine {
-            fs: -1.0,
+    pub fn new(fs: Flt, freq: Flt) -> Result<Sine> {
+        if fs <= 0. {
+            bail!("Invalid sampling frequency");
+        }
+        if freq >= fs / 2. {
+            bail!("Frequency of sine wave should be smaller than Nyquist frequency");
+        }
+
+        Ok(Sine {
+            fs,
             phase: 0.0,
             omg: 2.0 * pi * freq,
-        }
+        })
     }
 }
-impl Source for Sine {
+impl SourceImpl for Sine {
     fn genSignal_unscaled(&mut self, sig: &mut dyn ExactSizeIterator<Item = &mut Flt>) {
         if self.fs <= 0.0 {
             sig.for_each(|s| {
@@ -99,7 +149,79 @@ impl Source for Sine {
         self.fs = fs;
         self.phase = 0.0;
     }
-    fn clone_dyn(&self) -> Box<dyn Source> {
+    fn clone_dyn(&self) -> Box<dyn SourceImpl> {
         Box::new(self.clone())
     }
 }
+
+#[cfg_attr(feature = "python-bindings", pyclass)]
+#[derive(Debug, Clone)]
+struct Sweep {
+    params: SweepParams,
+    // Generated time-periodic buffer
+    gen: Dcol,
+    N: usize,
+}
+impl Sweep {
+    fn new(
+        fs: Flt,
+        fl_: Flt,
+        fu_: Flt,
+        sweep_time: Flt,
+        quiet_time: Flt,
+        sweeptype: SweepType,
+    ) -> Result<Self> {
+        let params = SweepParams::new(fs, fl_, fu_, sweep_time, quiet_time, sweeptype)?;
+        let gen = params.getSignal();
+
+        Ok(Sweep { params, gen, N: 0 })
+    }
+}
+// Linear forward or backward sweep phase
+impl SourceImpl for Sweep {
+    fn genSignal_unscaled(&mut self, sig: &mut dyn ExactSizeIterator<Item = &mut Flt>) {
+        let sweep_iter = self.gen.as_slice().unwrap().iter().cycle().skip(self.N);
+        for (sig, sweep_sample) in sig.zip(sweep_iter) {
+            *sig = *sweep_sample;
+            self.N += 1;
+        }
+        // Modulo number of samples in generator
+        self.N %= self.gen.len();
+    }
+
+    fn reset(&mut self, fs: Flt) {
+        self.gen = self.params.reset(fs);
+        self.N = 0;
+    }
+
+    fn clone_dyn(&self) -> Box<dyn SourceImpl> {
+        Box::new(self.clone())
+    }
+}
+
+impl Deref for Source {
+    type Target = Box<dyn SourceImpl>;
+    fn deref(&self) -> &Self::Target {
+        &self.src
+    }
+}
+impl DerefMut for Source {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.src
+    }
+}
+
+/// Source for the signal generator. Implementations are sine waves, sweeps, noise.
+pub trait SourceImpl: Send {
+    /// Generate the 'pure' source signal. Output is placed inside the `sig` argument.
+    fn genSignal_unscaled(&mut self, sig: &mut dyn ExactSizeIterator<Item = &mut Flt>);
+    /// Reset the source state, i.e. set phase to 0, etc
+    fn reset(&mut self, fs: Flt);
+    /// Used to make the Siggen struct cloneable
+    fn clone_dyn(&self) -> Box<dyn SourceImpl>;
+}
+impl Clone for Box<dyn SourceImpl> {
+    fn clone(&self) -> Self {
+        self.clone_dyn()
+    }
+}
diff --git a/src/siggen/sweep.rs b/src/siggen/sweep.rs
new file mode 100644
index 0000000..4afe5c6
--- /dev/null
+++ b/src/siggen/sweep.rs
@@ -0,0 +1,264 @@
+//! Sweep signal generation code
+use {
+    crate::config::*,
+    anyhow::{bail, Result},
+};
+const NITER_NEWTON: usize = 20;
+const twopi: Flt = 2. * pi;
+
+#[cfg_attr(feature = "python-bindings", pyclass)]
+#[derive(Debug, Clone)]
+pub enum SweepType {
+    /// Forward only logarithmic sweep, repeats itself
+    ForwardLog,
+    /// Reverse only logarithmic sweep, repeats itself
+    BackwardLog,
+    /// Continuous logarithmic sweep, repeats itself
+    ContinuousLog,
+
+    /// Forward only linear sweep, repeats itself
+    ForwardLin,
+    /// Reverse only linear sweep, repeats itself
+    BackwardLin,
+    /// Continuous linear sweep, repeats itself
+    ContinuousLin,
+}
+
+#[derive(Debug, Clone)]
+pub struct SweepParams {
+    // These parameters are described at [Source::newSweep]
+    fs: Flt,
+    fl: Flt,
+    fu: Flt,
+    sweep_time: Flt,
+    quiet_time: Flt,
+    sweeptype: SweepType,
+}
+impl SweepParams {
+    pub fn new(
+        fs: Flt,
+        fl_: Flt,
+        fu_: Flt,
+        sweep_time: Flt,
+        quiet_time: Flt,
+        sweeptype: SweepType,
+    ) -> Result<Self> {
+        if fs <= 0. {
+            bail!("Invalid sampling frequency: {} Hz", fs);
+        }
+        if fl_ > fu_ {
+            bail!("Lower frequency should be smaller than upper frequency");
+        }
+        if fu_ >= fs / 2. {
+            bail!("Upper frequency should be smaller than sampling frequency");
+        }
+        if sweep_time <= 0. {
+            bail!("Invalid sweep time, should be > 0.");
+        }
+        if 1. / sweep_time > fs / 2. {
+            bail!("Invalid sweep time: too short");
+        }
+
+        let (fl, fu) = if matches!(sweeptype, SweepType::BackwardLin | SweepType::BackwardLog) {
+            (fu_, fl_)
+        } else {
+            (fl_, fu_)
+        };
+        Ok(SweepParams {
+            fs,
+            fl,
+            fu,
+            sweep_time,
+            quiet_time,
+            sweeptype,
+        })
+    }
+    pub fn reset(&mut self, fs: Flt) -> Dcol {
+        self.fs = fs;
+        self.getSignal()
+    }
+
+    fn Ns(&self) -> usize {
+        (self.sweep_time * self.fs) as usize
+    }
+    /// Returns the phase as a function of time
+    fn getPhase(&self) -> Dcol {
+        match self.sweeptype {
+            SweepType::BackwardLin | SweepType::ForwardLin => self.getLinSweepFBPhase(),
+            SweepType::BackwardLog | SweepType::ForwardLog => self.getLogSweepFBPhase(),
+            SweepType::ContinuousLin => self.getLinSweepContPhase(),
+            SweepType::ContinuousLog => self.getLogSweepContPhase(),
+        }
+    }
+    pub fn getSignal(&self) -> Dcol {
+        let fs = self.fs;
+        // Number of samples in sweep
+        let Ns = (self.sweep_time * fs) as usize;
+        // Number of samples in quiet time
+        let Nq = (self.quiet_time * fs) as usize;
+
+        // Total number of samples
+        let N = Ns + Nq;
+
+        let phase = self.getPhase();
+        Dcol::from_iter((0..N).map(|i| if i < Ns { Flt::sin(phase[i]) } else { 0. }))
+    }
+
+    // Linear forward or backward sweep phase
+    fn getLinSweepFBPhase(&self) -> Dcol {
+        assert!(matches!(
+            self.sweeptype,
+            SweepType::BackwardLin | SweepType::ForwardLin
+        ));
+        let (Ns, fl, fu, fs) = (self.Ns(), self.fl, self.fu, self.fs);
+
+        // Time step
+        let Dt = 1. / fs;
+        let Nsf = Ns as Flt;
+        let K = (Dt * (fl * Nsf + 0.5 * (Nsf - 1.) * (fu - fl))).floor();
+        let eps_num = K / Dt - fl * Nsf - 0.5 * (Nsf - 1.) * (fu - fl);
+        let eps = eps_num / (0.5 * (Nsf - 1.));
+        let mut phase = 0.;
+        Dcol::from_iter((0..Ns).map(|n| {
+            let freq = fl + (n as Flt - 1.) / (Ns as Flt) * (fu + eps - fl);
+            let phase_out = phase;
+            phase += twopi * Dt * freq;
+            phase_out
+        }))
+    }
+
+    // Logarithmic forward or backward sweep phase
+    fn getLogSweepFBPhase(&self) -> Dcol {
+        assert!(matches!(
+            self.sweeptype,
+            SweepType::BackwardLog | SweepType::ForwardLog
+        ));
+
+        let (Ns, fl, fu, fs) = (self.Ns(), self.fl, self.fu, self.fs);
+        // // Time step
+        let Dt = 1. / fs;
+        let Nsf = Ns as Flt;
+        let mut k = fu / fl;
+        let K = (Dt * fl * (k - 1.) / ((k.powf(1.0 / Nsf)) - 1.)).floor();
+
+        /* Iterate k to the right solution */
+        (0..10).for_each(|_| {
+            let E = 1. + K / (Dt * fl) * (k.powf(1.0 / Nsf) - 1.) - k;
+            let dEdk = K / (Dt * fl) * k.powf(1.0 / Nsf) / (Nsf * k) - 1.;
+            k -= E / dEdk;
+        });
+
+        let mut phase = 0.;
+        Dcol::from_iter((0..Ns).map(|n| {
+            let nf = n as Flt;
+            let fnn = fl * k.powf(nf / Nsf);
+            let phase_old = phase;
+            phase += twopi * Dt * fnn;
+            phase_old
+        }))
+    }
+
+    // Continuous log sweep phase
+    fn getLogSweepContPhase(&self) -> Dcol {
+        assert!(matches!(self.sweeptype, SweepType::ContinuousLog));
+
+        let (Ns, fl, fu, fs) = (self.Ns(), self.fl, self.fu, self.fs);
+        // // Time step
+        let Dt = 1. / fs;
+        let Nf = Ns / 2;
+        let Nff = Nf as Flt;
+        let Nb = Ns - Nf;
+        let Nbf = Nb as Flt;
+        let k1 = fu / fl;
+        let phif1 = twopi * Dt * fl * (k1 - 1.) / (k1.powf(1.0 / Nff) - 1.);
+
+        let K =
+            (phif1 / twopi + Dt * fu * (1. / k1 - 1.) / ((1. / k1).powf(1.0 / Nbf) - 1.)).floor();
+        let mut k = k1;
+
+        /* Newton iterations to converge k to the value such that the sweep is
+         * continuous */
+        (0..NITER_NEWTON).for_each(|_| {
+            let E = (k - 1.) / (k.powf(1.0 / Nff) - 1.) + (k - 1.) / (1. - k.powf(-1.0 / Nbf))
+                - K / Dt / fl;
+
+            //     /* All parts of the derivative of above error E to k */
+            let dEdk1 = 1. / (k.powf(1.0 / Nff) - 1.);
+            let dEdk2 = (1. / k - 1.) / (k.powf(-1.0 / Nbf) - 1.);
+            let dEdk3 = -1. / (k * (k.powf(-1.0 / Nbf) - 1.));
+            let dEdk4 = k.powf(-1.0 / Nbf) * (1. / k - 1.)
+                / (Nbf * Flt::powi(Flt::powf(k, -1.0 / Nbf) - 1., 2));
+
+            let dEdk5 = -Flt::powf(k, 1.0 / Nff) * (k - 1.)
+                / (Nff * k * Flt::powi(Flt::powf(k, 1.0 / Nff) - 1., 2));
+
+            let dEdk = dEdk1 + dEdk2 + dEdk3 + dEdk4 + dEdk5;
+            k -= E / dEdk;
+        });
+
+        let mut phase = 0.;
+        Dcol::from_iter((0..Ns).map(|n| {
+            let nf = n as Flt;
+            let fnn = if n <= Nf {
+                fl * k.powf(nf / Nff)
+            } else {
+                fl * k * (1. / k).powf((nf - Nff) / Nbf)
+            };
+            let phase_old = phase;
+            phase += twopi * Dt * fnn;
+
+            phase_old
+        }))
+    }
+
+    // Continuous linear sweep phase
+    fn getLinSweepContPhase(&self) -> Dcol {
+        assert!(matches!(self.sweeptype, SweepType::ContinuousLin));
+
+        let (Ns, fl, fu, fs) = (self.Ns(), self.fl, self.fu, self.fs);
+        let Dt = 1. / fs;
+        let Nf = Ns / 2;
+        let Nb = Ns - Nf;
+        let Nff = Nf as Flt;
+        let Nbf = Nb as Flt;
+        /* Phi halfway */
+        let phih = twopi * Dt * (fl * Nff + 0.5 * (Nff - 1.) * (fu - fl));
+        let K = (phih / twopi + Dt * (fu * Nbf - (Nb as Flt - 1.) * (fu - fl))).floor();
+
+        let eps_num1 = (K - phih / twopi) / Dt;
+        let eps_num2 = -fu * Nbf + (Nbf - 1.) * (fu - fl);
+
+        let eps = (eps_num1 + eps_num2) / (0.5 * (Nbf + 1.));
+        let mut phase = 0.;
+        Dcol::from_iter((0..Ns).map(|n| {
+            let nf = n as Flt;
+            let freq = if n < Nf {
+                fl + nf / Nff * (fu - fl)
+            } else {
+                fu - (nf - Nff) / Nbf * (fu + eps - fl)
+            };
+            let phase_out = phase;
+            phase += twopi * Dt * freq;
+            phase_out
+        }))
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use approx::assert_abs_diff_eq;
+
+    use super::*;
+
+    #[test]
+    fn test_phase_linsweep1() {
+        let fs = 10.;
+        let fl = 1.;
+        let fu = 1.;
+        let phase = SweepParams::new(fs, fl, fu, 10., 0., SweepType::ForwardLin)
+            .unwrap()
+            .getLinSweepFBPhase();
+
+        assert_abs_diff_eq!(phase[10], &(twopi));
+    }
+}
diff --git a/src/slm/slm.rs b/src/slm/slm.rs
index 1c41720..a5297b9 100644
--- a/src/slm/slm.rs
+++ b/src/slm/slm.rs
@@ -285,7 +285,7 @@ mod test {
             .build()
             .unwrap();
 
-        let mut siggen = Siggen::newSine(1, 1000.);
+        let mut siggen = Siggen::newSine(1., 1, 1000.).unwrap();
         siggen.setAllMute(false);
         siggen.reset(fs);
         let mut data = vec![0.; N];