diff -rN -u -up old-stream-engine-0.4/src/stream.c new-stream-engine-0.4/src/stream.c
--- old-stream-engine-0.4/src/stream.c  2007-10-29 15:29:41.534763513 +0000
+++ new-stream-engine-0.4/src/stream.c  2007-10-29 15:29:43.534884285 +0000
@@ -1056,6 +1056,12 @@ make_src (TpStreamEngineStream *stream, 
     {
       if ((elem = getenv ("FS_AUDIO_SRC")) || (elem = getenv ("FS_AUDIOSRC")))
         {
+          if (!strcmp (elem, "none"))
+            {
+              DEBUG (stream, "FS_AUDIO_SRC set to \"none\", not making a src");
+              return NULL;
+            }
+
           DEBUG (stream, "making audio src with pipeline \"%s\"", elem);
           src = gst_parse_bin_from_description (elem, TRUE, NULL);
           g_assert (src);