I would do this in your DAW. Bring your BiaB tracks into your DAW then bring in your midi file. Erase all of the midi file but the bass track, or whatever track(s) you want to keep, then mute the BiaB’s corresponding tracks.

It is much easier to do things like this in a DAW plus you have many more options in a DAW that in BiaB for this kind of workflow.

Just my opinions.

FYI - you do have a DAW in RealBand.


I got banned from Weight Watchers for dropping a bag of M&Ms on the floor.
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64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware