diff --git a/src/lib.rs b/src/lib.rs
index 4161b37..dd05fcc 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -61,6 +61,8 @@ fn lasprs(m: &Bound<'_, PyModule>) -> PyResult<()> {
 
     // Signal generator
     m.add_class::<siggen::Siggen>()?;
+    m.add_class::<siggen::SiggenCommand>()?;
+    m.add_class::<siggen::SweepType>()?;
 
     // SLM
     m.add_class::<slm::TimeWeighting>()?;
diff --git a/src/siggen/siggen.rs b/src/siggen/siggen.rs
index 6854bdf..f7fcee3 100644
--- a/src/siggen/siggen.rs
+++ b/src/siggen/siggen.rs
@@ -1,7 +1,7 @@
 use super::siggenchannel::SiggenChannelConfig;
-use super::SiggenCommand;
 use super::source::{self, *};
 use super::sweep::SweepType;
+use super::SiggenCommand;
 use crate::config::*;
 use crate::filter::Filter;
 use anyhow::{bail, Result};
@@ -46,6 +46,21 @@ impl Siggen {
     fn newSine_py(fs: Flt, freq: Flt, nchannels: usize) -> PyResult<Siggen> {
         Ok(Siggen::newSine(fs, nchannels, freq)?)
     }
+    #[pyo3(name = "newSweep")]
+    #[staticmethod]
+    fn newSweep_py(
+        fs: Flt,
+        nchannels: usize,
+        fl: Flt,
+        fu: Flt,
+        sweep_time: Flt,
+        quiet_time: Flt,
+        sweep_type: SweepType,
+    ) -> Result<Self> {
+        Ok(Siggen::newSweep(
+            fs, nchannels, fl, fu, sweep_time, quiet_time, sweep_type,
+        )?)
+    }
 }
 
 impl Siggen {
diff --git a/src/siggen/sweep.rs b/src/siggen/sweep.rs
index 4afe5c6..ef8e310 100644
--- a/src/siggen/sweep.rs
+++ b/src/siggen/sweep.rs
@@ -6,6 +6,8 @@ use {
 const NITER_NEWTON: usize = 20;
 const twopi: Flt = 2. * pi;
 
+/// Enumerator representing the type of sweep source to create. Used as
+/// parameter in [Siggen::newSweep].
 #[cfg_attr(feature = "python-bindings", pyclass)]
 #[derive(Debug, Clone)]
 pub enum SweepType {
@@ -37,8 +39,8 @@ pub struct SweepParams {
 impl SweepParams {
     pub fn new(
         fs: Flt,
-        fl_: Flt,
-        fu_: Flt,
+        fl: Flt,
+        fu: Flt,
         sweep_time: Flt,
         quiet_time: Flt,
         sweeptype: SweepType,
@@ -46,10 +48,10 @@ impl SweepParams {
         if fs <= 0. {
             bail!("Invalid sampling frequency: {} Hz", fs);
         }
-        if fl_ > fu_ {
+        if fl > fu {
             bail!("Lower frequency should be smaller than upper frequency");
         }
-        if fu_ >= fs / 2. {
+        if fu >= fs / 2. {
             bail!("Upper frequency should be smaller than sampling frequency");
         }
         if sweep_time <= 0. {
@@ -59,10 +61,11 @@ impl SweepParams {
             bail!("Invalid sweep time: too short");
         }
 
+        // For backward sweeps, we just reverse the start and stop frequency.
         let (fl, fu) = if matches!(sweeptype, SweepType::BackwardLin | SweepType::BackwardLog) {
-            (fu_, fl_)
+            (fu, fl)
         } else {
-            (fl_, fu_)
+            (fl, fu)
         };
         Ok(SweepParams {
             fs,