- Fixed: S_ClearSoundData() did not stop any channels before freeing the

samples, a problem for the alternate sound renderer if it happened to be
  playing any sounds at the time, since it would try to keep on playing them.

SVN r483 (trunk)

src/s_advsound.cpp

@@ -746,6 +746,7 @@ static void S_ClearSoundData()
 
 	if (GSnd != NULL)
 	{
+		GSnd->StopAllChannels();
 		for (i = 0; i < S_sfx.Size(); ++i)
 		{
 			GSnd->UnloadSound (&S_sfx[i]);