Quote:
I'm thinking this changes the sound (register) without changing the notation


It serves this purpose, but I think the original intent was that some synths mapped their sounds in different octaves, so depending upon the synth you use for, say the bass track, it might not play correctly (an octave off), so this took care of it. Back when BIAB was MIDI only, you generally only used one single MIDI softsynth (probably the VSC-3 that came with it), or an external hardware synth, so it was not a big deal to make it a global setting. I have a number of bass soundfonts that are mapped in different octaves and this lets you compensate for it, but if I change to a different soundfont, I would have to go back in and make this change again.

John

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