FOCUS Enhancements 3.2 - Manual (Page 147)

External Control Commands
133
Audio and Video Setting Changes
mpgSetVolumeLeftRight
The mpgSetVolumeLeftRight command sets the left and right audio
volumes independently. The default volume level is 124. Lowering
this value will make the volume softer or raising this value will
make the volume louder.
mpgSetVolumeLeftRight 0 channel leftVolume rightVolume
Parameters
channel
0 based index of the channel on the Firefly.
leftVolume
0-255 the audio level on the left channel.
rightVolume
0-255 the audio level on the right channel.
mpgMute
The mpgMute command turns off the audio.
mpgMute 0 channel
Parameters
channel
0 based index of the channel on the Firefly (0).
mpgUnMute
The mpgUnMute command turns on the audio.
mpgUnMute 0 channel
Parameters
channel
0 based index of the channel on the Firefly (0).