Yes you can do this with MIDI in BiaB but it is a PITA. What you will need is a drum map of your MIDI drum sound source. You will need to have that sound source set up as your BiaB drum sound source (I do not use external sounds, hard synth or soft synth, in BiaB so others will have to show you how to do this). Then you have to match what your external drum map is to BiaB's drum map (this is not easy as BiaB's drum map is drum labeled, bass, snare, etc, and not in their corresponding MIDI note number). Then you can either move whatever note you want to a new sound, say closed hi hat to open hi hat, or you can add any note. You do this in the edit notation mode.

Now having done this it is much easier doing this in a DAW. I use a number of different drum maps matching my various drum soft synths in Studio One Pro very easily. Note that once I have a MIDI drum map conversion finished in Studio One Pro I can save it. I don't think that is possible to save a drum map conversion in BiaB.

Bottom line is do this in a DAW! YMMV

I hope this helps.

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64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware