BGMVOL (Command)

is a command for controlling the volume of the sounds playing on any of the 8 tracks.

If  has only one parameter, track 0 is used and the parameter specifies a volume. If  has two parameters, the first specifies the track number and the second is the volume.

The track number must be between 0 and 7 inclusive. The volume must be between 0 and 127 inclusive. The command sets the music playing on the specified track to the specified volume.