MovetoGroove, OK now I understand and think it is a good idea. Mark, the slider idea is a good one. Especially if it ranges from simple triads to complex jazz chords, all of course inclusive to BiaB.
Imagine a dynamic slider, where complexity starts at 0 and increases to 11 over the course of several repetitions.
Throw in a dynamic tempo slider that starts slow and speeds the piece up.
Toss in random key variations and your music student will be gasping for air like a pitbull on a treadmill! =8^)