diff --git a/src/dsp/filter/channelizer/PolyphaseChannelSource.java b/src/dsp/filter/channelizer/PolyphaseChannelSource.java
index 8a36d9be..cf6914d5 100644
--- a/src/dsp/filter/channelizer/PolyphaseChannelSource.java
+++ b/src/dsp/filter/channelizer/PolyphaseChannelSource.java
@@ -18,8 +18,10 @@
  ******************************************************************************/
 package dsp.filter.channelizer;
 
+import channel.heartbeat.Heartbeat;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import sample.Listener;
 import sample.OverflowableTransferQueue;
 import sample.complex.ComplexBuffer;
 import sample.real.IOverflowListener;
@@ -184,6 +186,18 @@ public class PolyphaseChannelSource extends ComplexChannelSource
         mLog.debug("Request for frequency correction: " + correction + " -- not yet implemented");
     }
 
+    @Override
+    public void setHeartbeatListener(Listener<Heartbeat> listener)
+    {
+        //TODO: implement this
+    }
+
+    @Override
+    public void removeHeartbeatListener()
+    {
+        //TODO: implement this
+    }
+
     @Override
     public void reset()
     {
diff --git a/src/dsp/filter/channelizer/output/TwoChannelOutputProcessor.java b/src/dsp/filter/channelizer/output/TwoChannelOutputProcessor.java
index 970777f3..56d943ad 100644
--- a/src/dsp/filter/channelizer/output/TwoChannelOutputProcessor.java
+++ b/src/dsp/filter/channelizer/output/TwoChannelOutputProcessor.java
@@ -79,6 +79,6 @@ public class TwoChannelOutputProcessor extends ChannelOutputProcessor
 //        float i = channels[mChannelOffset];
 //        float q = channels[mChannelOffset + 1];
 
-        listener.receive(getFrequencyCorrectedInphase(i, q), getFrequencyCorrectedQuadrature(i, q));
+//        listener.receive(getFrequencyCorrectedInphase(i, q), getFrequencyCorrectedQuadrature(i, q));
     }
 }
diff --git a/src/instrument/tap/stream/BinaryTapViewPanel.java b/src/instrument/tap/stream/BinaryTapViewPanel.java
index 07b72667..03ae5fdf 100644
--- a/src/instrument/tap/stream/BinaryTapViewPanel.java
+++ b/src/instrument/tap/stream/BinaryTapViewPanel.java
@@ -93,7 +93,7 @@ public class BinaryTapViewPanel extends TapViewPanel
 	 * Paints a polyline representing a boolean value with a 0 or 1 label in 
 	 * the middle of it
 	 * 
-	 * @param graphics
+	 * @param graphics object
 	 * @param index - index of the sample int the sample buffer
 	 * @param value - bit value, 0 or 1
 	 */
diff --git a/src/module/ProcessingChain.java b/src/module/ProcessingChain.java
index 9047051d..6736aece 100644
--- a/src/module/ProcessingChain.java
+++ b/src/module/ProcessingChain.java
@@ -320,7 +320,12 @@ public class ProcessingChain implements IChannelEventListener
 
         if(module instanceof ISourceEventListener)
         {
-            mFrequencyChangeEventBroadcaster.addListener(frequencyChangeEventListener);
+            Listener<SourceEvent> listener = ((ISourceEventListener)module).getSourceEventListener();
+
+            if(listener != null)
+            {
+                mFrequencyChangeEventBroadcaster.addListener(listener);
+            }
         }
 
         if(module instanceof IHeartbeatListener)