Hi Nonchai,

Volume control works this way because Band-in-a-Box usually uses one instance of the same multi-channel synthesizer (software or hardware) for all of your MIDI sounds, so attenuating the volume by using a gain stage after the synth wouldn't work for individual track volumes, it would affect all of the tracks at once.

The gain stage method works well in a DAW because each MIDI track generally has its own instance of a synth (which only became possible in BIAB very recently).

I'll be happy to submit a request to optionally use that method only when softsynths are assigned to channels other than "Default Synth", and have volume work on them the same way it works on audio tracks. I can't think of any reason that wouldn't work.

Cheers
Kent