What version of BIAB are you using?

If you are using Realtracks, these are audio and so the range of the bass is already set and cannot be changed.

If you are using MIDI, then the range of the bass is more likely determined by the softsynth being used. I've found that if MIDI notes go too low, there is often no synthesiser sound for them.

That said, to change the lowest pitch for MIDI bass, follow the numbers on the image below. (It's under "Options | Preferences | Arrange"). If you don't hear anything, change the sound to Piano and see if it works.

From the sounds of things, you probably need to add B1 (lower B) or B2 (higher B) where E2 is highlighted.

Regards,
Noel

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