diff --git a/lasp/c/lasp_sosfilterbank.h b/lasp/c/lasp_sosfilterbank.h
index 1b851a0..b38309c 100644
--- a/lasp/c/lasp_sosfilterbank.h
+++ b/lasp/c/lasp_sosfilterbank.h
@@ -12,7 +12,7 @@
 #include "lasp_mat.h"
 
 #define MAX_SOS_FILTER_BANK_SIZE 40
-#define MAX_SOS_FILTER_BANK_NSECTIONS 6
+#define MAX_SOS_FILTER_BANK_NSECTIONS 10
 
 typedef struct Sosfilterbank Sosfilterbank;
 
diff --git a/lasp/lasp_avstream.py b/lasp/lasp_avstream.py
index 8f8f91e..b810251 100644
--- a/lasp/lasp_avstream.py
+++ b/lasp/lasp_avstream.py
@@ -5,7 +5,7 @@ Description: Read data from image stream and record sound at the same time
 """
 #import cv2 as cv
 from .lasp_atomic import Atomic
-from threading import Thread, Condition, Lock
+from threading import Thread, Lock
 import numpy as np
 
 import time
@@ -94,7 +94,6 @@ class AvStream:
         self._callbacklock = Lock()
 
         self._running = Atomic(False)
-        self._running_cond = Condition()
 
         self._video = video
         self._video_started = Atomic(False)
@@ -187,8 +186,10 @@ class AvStream:
             # present, and there should be output callbacks, we explicitly set
             # the output buffer to zero
             noutput_cb = len(self._callbacks[AvType.audio_output])
+
             shouldhaveoutput = (self.avtype == AvType.audio_output or
                                 self.daqconfig.duplex_mode)
+
             if noutput_cb == 0 and shouldhaveoutput and outdata is not None:
                 outdata[:, :] = 0
 
@@ -212,14 +213,15 @@ class AvStream:
 
     def stop(self):
         self._running <<= False
-        with self._running_cond:
-            self._running_cond.notify()
+
         if self._video:
             self._videothread.join()
             self._videothread = None
+
         self._aframectr <<= 0
         self._vframectr <<= 0
         self._video_started <<= False
+
         self._audiobackend.stop()
         self._audiobackend = None
 
diff --git a/lasp/lasp_slm.py b/lasp/lasp_slm.py
index d2907de..5c9a944 100644
--- a/lasp/lasp_slm.py
+++ b/lasp/lasp_slm.py
@@ -31,7 +31,7 @@ class SLM:
 
     def __init__(self,
                  fs,
-                 fbdesigner, 
+                 fbdesigner=None, 
                  tw=TimeWeighting.fast,
                  fw=FreqWeighting.A,
                  xmin = None,
@@ -58,10 +58,16 @@ class SLM:
             """
 
         self.fbdesigner = fbdesigner
-        if xmin is None: 
+        if xmin is None and fbdesigner is not None:
             xmin = fbdesigner.xs[0]
-        if xmax is None: 
+        elif fbdesigner is None:
+            xmin = 0
+            
+        if xmax is None and self.fbdesigner is not None: 
             xmax = fbdesigner.xs[-1]
+        elif fbdesigner is None:
+            xmax = 0
+
         self.xs = list(range(xmin, xmax + 1))
 
         nfilters = len(self.xs)
@@ -81,12 +87,16 @@ class SLM:
         # 'Probe' size of filter coefficients
         self.nom_txt = []
 
+        # This is a bit of a hack, as the 5 is hard-encoded here, but should in
+        # fact be coming from somewhere else..
+        sos_overall = np.array([1,0,0,1,0,0]*5, dtype=float)
+
         if fbdesigner is not None:
             assert fbdesigner.fs == fs
-            sos0 = fbdesigner.createSOSFilter(self.xs[0]).flatten()
+            sos_firstx = fbdesigner.createSOSFilter(self.xs[0]).flatten()
             self.nom_txt.append(fbdesigner.nominal_txt(self.xs[0]))
-            sos = np.empty((nfilters, sos0.size), dtype=float, order='C')
-            sos[0, :] = sos0
+            sos = np.empty((nfilters, sos_firstx.size), dtype=float, order='C')
+            sos[0, :] = sos_firstx
 
             for i, x in enumerate(self.xs[1:]):
                 sos[i+1, :] = fbdesigner.createSOSFilter(x).flatten()
@@ -95,16 +105,17 @@ class SLM:
             if include_overall:
                 # Create a unit impulse response filter, every third index equals 
                 # 1, so b0 = 1 and a0 is 1 (by definition)
-                sos[-1,:] = 0
-                sos[-1,::3] = 1
+                # a0 = 1, b0 = 1, rest is zero
+                sos[-1,:] = sos_overall
                 self.nom_txt.append('overall')
+
         else:
             # No filterbank, means we do only compute the overall values. This
             # means that in case of include_overall, it creates two overall
             # channels. That would be confusing, so we do not allow it.
-            assert include_overall == False
-            sos = None
-            self.nom_txt.append('overall')
+            if include_overall:
+                sos = sos_overall[np.newaxis,:]
+                self.nom_txt.append('overall')
 
         self.slm = pyxSlm(prefilter, sos,
                           fs, tw[0], level_ref_value)