Hi Nonchai,

In Synthmaster, you need to right-click on the Volume knob and select "MIDI Learn (Global)", then move the volume slider for that track on Band-in-a-Box's mixer. Synthmaster is now mapped to MIDI CC7 for volume.

I just loaded the FM8 demo, and its volume was already mapped to CC7 without me having to do anything. I move the volume slider on the BIAB mixer, and FM8's volume slider moves at the same time. If this isn't working for you, you may have accidentally removed that mapping. You can see the MIDI mappings by clicking on Master and looking in the "MIDI Controller Assignment" list on the right. If you right-click on that list and select Reset List, that'll probably get it back.

Thanks
Kent
PG Music