diff --git a/module_usb_audio/endpoint0/endpoint0.c b/module_usb_audio/endpoint0/endpoint0.c
index f3d4f51b..66cbc2af 100755
--- a/module_usb_audio/endpoint0/endpoint0.c
+++ b/module_usb_audio/endpoint0/endpoint0.c
@@ -1,6 +1,4 @@
 /**
- * g
- * @file    endpoint0.xc
  * @brief   Implements endpoint zero for an USB Audio 1.0/2.0 device
  * @author  Ross Owen, XMOS Semiconductor
  */
@@ -15,7 +13,7 @@
 
 #include "devicedefines.h"
 #include "usb_device.h"          /* Standard descriptor requests */
-#include "descriptors.h"       /* This devices descriptors */
+#include "descriptors.h"         /* This devices descriptors */
 #include "commands.h"
 #include "audiostream.h"
 #include "hostactive.h"
@@ -31,7 +29,7 @@
 #endif
 
 #ifndef __XC__
-/* Support for C */
+/* Support for xCORE  channels in C */
 #define null 0
 #define outuint(c, x)   asm ("out res[%0], %1" :: "r" (c), "r" (x))
 #define chkct(c, x)     asm ("chkct res[%0], %1" :: "r" (c), "r" (x))
@@ -65,11 +63,9 @@ unsigned int DFU_mode_active = 0;         // 0 - App active, 1 - DFU active
 /* Global volume and mute tables */
 int volsOut[NUM_USB_CHAN_OUT + 1];
 unsigned int mutesOut[NUM_USB_CHAN_OUT + 1];
-//unsigned int multOut[NUM_USB_CHAN_OUT + 1];
 
 int volsIn[NUM_USB_CHAN_IN + 1];
 unsigned int mutesIn[NUM_USB_CHAN_IN + 1];
-//unsigned int multIn[NUM_USB_CHAN_IN + 1];
 
 #ifdef MIXER
 unsigned char mixer1Crossbar[18];
@@ -204,7 +200,7 @@ const unsigned g_chanCount_In_HS[INPUT_FORMAT_COUNT]       = {HS_STREAM_FORMAT_I
 
 /* Endpoint 0 function.  Handles all requests to the device */
 void Endpoint0(chanend c_ep0_out, chanend c_ep0_in, chanend c_audioControl,
-    chanend c_mix_ctl, chanend c_clk_ctl, chanend c_EANativeTransport_ctrl, CLIENT_INTERFACE(i_dfu, dfuInterface))
+    chanend c_mix_ctl, chanend c_clk_ctl, chanend c_EANativeTransport_ctrl, CLIENT_INTERFACE(i_dfu, dfuInterface) VENDOR_REQUESTS_PARAMS_DEC_)
 {
     USB_SetupPacket_t sp;
     XUD_ep ep0_out = XUD_InitEp(c_ep0_out);
@@ -271,10 +267,10 @@ void Endpoint0(chanend c_ep0_out, chanend c_ep0_in, chanend c_audioControl,
 
     /* Init mixer inputs */
     for(int j = 0; j < MAX_MIX_COUNT; j++)
-    for(int i = 0; i < MIX_INPUTS; i++)
-    {
-        mixSel[j][i] = i;
-    }
+        for(int i = 0; i < MIX_INPUTS; i++)
+        {
+            mixSel[j][i] = i;
+        }
 #endif
 
 #ifdef VENDOR_AUDIO_REQS
@@ -288,7 +284,7 @@ void Endpoint0(chanend c_ep0_out, chanend c_ep0_in, chanend c_audioControl,
         /* Stop audio */
         outuint(c_audioControl, SET_SAMPLE_FREQ);
         outuint(c_audioControl, AUDIO_STOP_FOR_DFU);
-        // No Handshake
+        /* No Handshake */
         DFU_mode_active = 1;
     }
 #endif
@@ -628,6 +624,17 @@ void Endpoint0(chanend c_ep0_out, chanend c_ep0_in, chanend c_audioControl,
 
         } /* if(result == XUD_RES_OKAY) */
 
+        //if(i_vendorRequests != null)
+        {
+            if(result == XUD_RES_ERR)
+            {
+                /* Run vendor defined parsing/processing */
+                /* Note, an interface might seem ideal hear but this *must* be executed on the same
+                 * core sure to shared memory depandancy */
+                VendorRequests(ep0_out, ep0_in, &sp VENDOR_REQUESTS_PARAMS_);
+            }
+        }
+
         if(result == XUD_RES_ERR)
         {
 #ifdef DFU
diff --git a/module_usb_audio/endpoint0/endpoint0.h b/module_usb_audio/endpoint0/endpoint0.h
index ef3afaa8..b5303864 100644
--- a/module_usb_audio/endpoint0/endpoint0.h
+++ b/module_usb_audio/endpoint0/endpoint0.h
@@ -3,6 +3,8 @@
 #define _ENDPOINT0_H_
 
 #include "dfu_interface.h"
+#include "devicedefines.h"
+#include "vendorrequests.h"
 
 /** Function implementing Endpoint 0 for enumeration, control and configuration
  *  of USB audio devices. It uses the descriptors defined in ``descriptors_2.h``.
@@ -21,6 +23,7 @@
  *                                  endpoint manager if present
  */
 void Endpoint0(chanend c_ep0_out, chanend c_ep0_in, chanend c_audioCtrl,
-        chanend ?c_mix_ctl,chanend ?c_clk_ctl, chanend ?c_EANativeTransport_ctr, client interface i_dfu dfuInterface);
+        chanend ?c_mix_ctl,chanend ?c_clk_ctl, chanend ?c_EANativeTransport_ctr, client interface i_dfu dfuInterface
+         VENDOR_REQUESTS_PARAMS_DEC_);
 
 #endif
diff --git a/module_usb_audio/endpoint0/vendorrequests.c b/module_usb_audio/endpoint0/vendorrequests.c
new file mode 100644
index 00000000..d5196685
--- /dev/null
+++ b/module_usb_audio/endpoint0/vendorrequests.c
@@ -0,0 +1,26 @@
+
+
+#include "xud.h"
+#include "vendorrequests.h"
+
+int VendorAudioRequests(XUD_ep ep0_out, XUD_ep ep0_in, unsigned char bRequest, unsigned char cs, unsigned char cn,
+    unsigned short unitId, unsigned char direction, chanend c_audioControl,
+    NULLABLE_RESOURCE(chanend, c_mix_ctl),
+    NULLABLE_RESOURCE(chanend, c_clk_ctL)) __attribute__ ((weak));
+
+int VendorAudioRequests(XUD_ep ep0_out, XUD_ep ep0_in, unsigned char bRequest, unsigned char cs, unsigned char cn,
+    unsigned short unitId, unsigned char direction, chanend c_audioControl,
+    NULLABLE_RESOURCE(chanend, c_mix_ctl),
+    NULLABLE_RESOURCE(chanend, c_clk_ctL))
+{
+
+    return XUD_RES_ERR;
+}
+
+int VendorRequests(XUD_ep ep0_out, XUD_ep ep0_in,  REFERENCE_PARAM(USB_SetupPacket_t, sp) VENDOR_REQUESTS_PARAMS_DEC_) __attribute__ ((weak));
+
+int VendorRequests(XUD_ep ep0_out, XUD_ep ep0_in,  REFERENCE_PARAM(USB_SetupPacket_t, sp) VENDOR_REQUESTS_PARAMS_DEC_)
+{
+    return XUD_RES_ERR;
+}
+
diff --git a/module_usb_audio/endpoint0/vendorrequests.h b/module_usb_audio/endpoint0/vendorrequests.h
index 99662fd1..8dcc4120 100644
--- a/module_usb_audio/endpoint0/vendorrequests.h
+++ b/module_usb_audio/endpoint0/vendorrequests.h
@@ -2,6 +2,9 @@
 #define _VENDORREQUESTS_H_
 
 #include <xccompat.h>
+#include "devicedefines.h"
+#include "xud.h"
+#include "usb_std_requests.h"
 
 /* Functions that handle vustomer vendor requests.
  *
@@ -11,10 +14,24 @@
  *
  * */
 
+#define PREPEND_COMMA(x) ,x
+
+#ifndef VENDOR_REQUESTS_PARAMS
+#define VENDOR_REQUESTS_PARAMS_
+#define VENDOR_REQUESTS_PARAMS_DEC_
+#else
+#define VENDOR_REQUESTS_PARAMS_ PREPEND_COMMA(VENDOR_REQUESTS_PARAMS)
+#define VENDOR_REQUESTS_PARAMS_DEC_ PREPEND_COMMA(VENDOR_REQUESTS_PARAMS_DEC)
+#endif
+
 int VendorAudioRequests(XUD_ep ep0_out, XUD_ep ep0_in, unsigned char bRequest, unsigned char cs, unsigned char cn,
     unsigned short unitId, unsigned char direction, chanend c_audioControl,
     NULLABLE_RESOURCE(chanend, c_mix_ctl),
     NULLABLE_RESOURCE(chanend, c_clk_ctL));
 
+
+int VendorRequests(XUD_ep ep0_out, XUD_ep ep0_in,  REFERENCE_PARAM(USB_SetupPacket_t, sp) VENDOR_REQUESTS_PARAMS_DEC_);
+
+
 #endif
 
diff --git a/module_usb_audio/main.xc b/module_usb_audio/main.xc
index 855e3f23..ba5c232c 100755
--- a/module_usb_audio/main.xc
+++ b/module_usb_audio/main.xc
@@ -287,6 +287,7 @@ void usb_audio_core(chanend c_mix_out
 , chanend ?c_clk_int
 , chanend ?c_clk_ctl
 , client interface i_dfu ?dfuInterface
+VENDOR_REQUESTS_PARAMS_DEC_
 )
 {
     chan c_sof;
@@ -381,7 +382,7 @@ void usb_audio_core(chanend c_mix_out
         /* Endpoint 0 Core */
         {
             thread_speed();
-            Endpoint0( c_xud_out[0], c_xud_in[0], c_aud_ctl, c_mix_ctl, c_clk_ctl, c_EANativeTransport_ctrl, dfuInterface);
+            Endpoint0( c_xud_out[0], c_xud_in[0], c_aud_ctl, c_mix_ctl, c_clk_ctl, c_EANativeTransport_ctrl, dfuInterface VENDOR_REQUESTS_PARAMS_);
         }
 
         /* Decoupling core */
@@ -581,6 +582,7 @@ int main()
                 , c_mix_ctl
 #endif
                 , c_clk_int, c_clk_ctl, dfuInterface
+                VENDOR_REQUESTS_PARAMS_
 
             );
         }