Cog Audio: Don't overfill the output buffer when asked to reset the buffers

Audio/Chain/Node.m

@@ -54,9 +54,8 @@
 		{
             if (availOutput)
             {
-                // must unlock buffer before waiting, may as well write silence
+                // Unlock the buffer
-                memset(writePtr, 0, availOutput);
+                [buffer didWriteLength:0];
-                [buffer didWriteLength:availOutput];
             }
 			[semaphore wait];
 		}