Index: /trunk/src/VBox/Devices/Audio/AudioMixer.cpp
===================================================================
--- /trunk/src/VBox/Devices/Audio/AudioMixer.cpp	(revision 64867)
+++ /trunk/src/VBox/Devices/Audio/AudioMixer.cpp	(revision 64868)
@@ -330,5 +330,5 @@
         return VERR_NOT_FOUND;
 
-    AssertMsgReturn(pSink->pParent == pMixer, ("Sink '%s' is not part of mixer '%s'\n",
+    AssertMsgReturn(pSink->pParent == pMixer, ("%s: Is not part of mixer '%s'\n",
                                                pSink->pszName, pMixer->pszName), VERR_NOT_FOUND);
 
@@ -769,5 +769,5 @@
     AssertPtrReturn(pSink, 0);
 
-    AssertMsg(pSink->enmDir == AUDMIXSINKDIR_INPUT, ("Can't read from a non-input sink\n"));
+    AssertMsg(pSink->enmDir == AUDMIXSINKDIR_INPUT, ("%s: Can't read from a non-input sink\n", pSink->pszName));
 
     int rc = RTCritSectEnter(&pSink->CritSect);
@@ -813,5 +813,5 @@
     AssertPtrReturn(pSink, 0);
 
-    AssertMsg(pSink->enmDir == AUDMIXSINKDIR_OUTPUT, ("Can't write to a non-output sink\n"));
+    AssertMsg(pSink->enmDir == AUDMIXSINKDIR_OUTPUT, ("%s: Can't write to a non-output sink\n", pSink->pszName));
 
     int rc = RTCritSectEnter(&pSink->CritSect);
@@ -1535,6 +1535,8 @@
         return rc;
 
-    AssertMsg(pSink->fStatus & AUDMIXSINK_STS_RUNNING, ("Can't write to a sink which is not running (anymore)\n"));
-    AssertMsg(pSink->enmDir == AUDMIXSINKDIR_OUTPUT,   ("Can't write to a sink which is not an output sink\n"));
+    AssertMsg(pSink->fStatus & AUDMIXSINK_STS_RUNNING, ("%s: Can't write to a sink which is not running (anymore)\n",
+                                                        pSink->pszName));
+    AssertMsg(pSink->enmDir == AUDMIXSINKDIR_OUTPUT,   ("%s: Can't write to a sink which is not an output sink\n",
+                                                        pSink->pszName));
 
     Log3Func(("[%s] enmOp=%d, cbBuf=%RU32\n", pSink->pszName, enmOp, cbBuf));