diff --git a/module_usb_aud_shared/audio.h b/module_usb_aud_shared/audio.h
index 77da8b77..8fc0568d 100644
--- a/module_usb_aud_shared/audio.h
+++ b/module_usb_aud_shared/audio.h
@@ -12,9 +12,7 @@
  *               receiving/transmitting samples
  *  \param c_config An optional channel that will be passed on to the 
  *                  CODEC configuration functions.
- *  \param c_i2c An optional channel that will be passed on to the 
- *                  functions requiring i2c.
  */
-void audio(chanend c_in, chanend ?c_dig, chanend ?c_config, chanend ?c_i2c);
+void audio(chanend c_in, chanend ?c_dig, chanend ?c_config);
 
 #endif // __audio_h__
diff --git a/module_usb_aud_shared/audio.xc b/module_usb_aud_shared/audio.xc
index 2d67d51c..e207e05d 100755
--- a/module_usb_aud_shared/audio.xc
+++ b/module_usb_aud_shared/audio.xc
@@ -496,7 +496,7 @@ static unsigned dummy_deliver(chanend c_out) {
     return 0;
 }
 
-void audio(chanend c_mix_out, chanend ?c_dig_rx, chanend ?c_config, chanend ?c_i2c) 
+void audio(chanend c_mix_out, chanend ?c_dig_rx, chanend ?c_config) 
 {
 #ifdef SPDIF
     chan c_spdif_out;
@@ -511,10 +511,10 @@ void audio(chanend c_mix_out, chanend ?c_dig_rx, chanend ?c_config, chanend ?c_i
 #endif
 
   	/* Initialise master clock generation */
-    ClockingInit(c_i2c);
+    ClockingInit();
 
     /* Perform required CODEC/ADC/DAC initialisation */
-    CodecInit(c_config, c_i2c);
+    CodecInit(c_config);
 
     while(1)
     {
@@ -533,7 +533,7 @@ void audio(chanend c_mix_out, chanend ?c_dig_rx, chanend ?c_config, chanend ?c_i
         divide = mClk / ( curSamFreq * 64 );
 
         /* Configure clocking for required master clock */
-        ClockingConfig(mClk, c_i2c); 
+        ClockingConfig(mClk); 
 
         if(!firstRun)
         {
@@ -553,7 +553,7 @@ void audio(chanend c_mix_out, chanend ?c_dig_rx, chanend ?c_config, chanend ?c_i
         firstRun = 0;
       
         /* Configure CODEC/DAC/ADC for SampleFreq/MClk */
-        CodecConfig(curSamFreq, mClk, c_config, c_i2c);
+        CodecConfig(curSamFreq, mClk, c_config);
 
         /* Configure audio ports */
         ConfigAudioPorts(divide);    
diff --git a/module_usb_aud_shared/clocking/clocking.h b/module_usb_aud_shared/clocking/clocking.h
index a02ebf15..88fc786b 100644
--- a/module_usb_aud_shared/clocking/clocking.h
+++ b/module_usb_aud_shared/clocking/clocking.h
@@ -5,10 +5,10 @@
 /* Functions that handle master clock generation.  These need modifying for an existing design */
 
 /* Any initialisation required for master clock generation - run once at start up */
-void ClockingInit(chanend ?c);
+void ClockingInit(void);
 
 /* Configuration for a specific master clock frequency - run every sample frequency change */
-void ClockingConfig(unsigned mClkFreq, chanend ?c);
+void ClockingConfig(unsigned mClkFreq);
 
 
 /** Clock generation and digital audio I/O handling.
diff --git a/module_usb_aud_shared/codec/codec.h b/module_usb_aud_shared/codec/codec.h
index c97662ec..452ac900 100644
--- a/module_usb_aud_shared/codec/codec.h
+++ b/module_usb_aud_shared/codec/codec.h
@@ -6,9 +6,9 @@
 /* TODO Are the channel args required? */
 
 /* Any required CODEC initialisation - run once at start up */
-void CodecInit(chanend ?c_codec, chanend ?c_i2c);
+void CodecInit(chanend ?c_codec);
 
 /* Configure condec for a specific mClk/Sample frquency - run on every sample frequency change */
-void CodecConfig(unsigned samFreq, unsigned mClk, chanend ?c_codec, chanend ?c_i2c);
+void CodecConfig(unsigned samFreq, unsigned mClk, chanend ?c_codec);
 
 #endif
diff --git a/module_usb_aud_shared/pll/pll.h b/module_usb_aud_shared/pll/pll.h
index bc555fcf..d79ca14f 100644
--- a/module_usb_aud_shared/pll/pll.h
+++ b/module_usb_aud_shared/pll/pll.h
@@ -1,4 +1,4 @@
-void PllInit(chanend c);
+void PllInit(void);
 
 
-void PllMult(unsigned mult, chanend c);
+void PllMult(unsigned mult);