--- bmp-0.9.7/Output/alsa/audio.c	2004-11-16 06:50:34.000000000 +0100
+++ bmp-0.9.7.patch/Output/alsa/audio.c	2005-05-17 02:58:31.000000000 +0200
@@ -472,6 +472,16 @@
                                             SND_MIXER_SCHN_FRONT_LEFT, l);
         snd_mixer_selem_set_playback_volume(pcm_element,
                                             SND_MIXER_SCHN_FRONT_RIGHT, r);
+
+        if (l == 0)
+                snd_mixer_selem_set_playback_switch(pcm_element, SND_MIXER_SCHN_FRONT_LEFT, 0);
+        else
+                snd_mixer_selem_set_playback_switch(pcm_element, SND_MIXER_SCHN_FRONT_LEFT, 1);
+
+        if (r == 0)
+                snd_mixer_selem_set_playback_switch(pcm_element, SND_MIXER_SCHN_FRONT_RIGHT, 0);
+        else
+                snd_mixer_selem_set_playback_switch(pcm_element, SND_MIXER_SCHN_FRONT_RIGHT, 1);
     }
 }