Here’s a nice “proof” that 9/8 is the same as 3/4 time. Look at Bach’s Jesu Joy of man’s desiring.

It’s written out here for lead violin (in 9/8) and trumpet, viola and violin in 3/4. All playing at the same tempo, on the same score. That’s an example of the two time signatures being interchangeable. All that is different is the notation, and BiaB has a button to switch between 9/8 and 3/4 for that purpose.

Same idea makes 12/8 = 4/4
and 6/8 = 2/4
Or better still for BiaB, two bars of 6/8 =4/4

Once you do that, the complicated world of 12/8, 6/8 and 9/8 become your old friends 4/4 and 3/4.

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Have Fun!
Peter Gannon
PG Music Inc.