Many different programs, not just music ones have controls like that. Photo editing for example. What I do is start with the lowest number, zero if it's available, see what that does then try the highest number and do that several times. That usually tells you how it works. Then put that control number back to zero and do the next one. Don't try testing 2 or 3 of them at the same time, too confusing to keep track of.

When you said the bridge section went to a different key and then transitioned back, that's standard procedure in all kinds of songs in many different genre's. Biab follows classical musical concepts and that kind of thing happens all the time. There are songs that have 2, 3 or 4 key changes going on. Biab also has a practice function where you set it to play a set of chords in all 12 keys using the cycle of 5ths every 8 or 12 bars so you can practice along and get familiar with how those keys sound relative to each other.

That's where Biab gets it reputation as a great teaching tool as well as creating songs from scratch or from what you input.

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.