I am confused. A chord can be as many bars as you want.

Or are you talking about the number of chords in a measure/bar? In 4/4 time you can have 4 chords per bar in your BiaB version. In 2/4 time you can have 2 chords per measure and in 3/4 you can have 3 chords per measure.

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I'm no longer allowed to go caroling at the psych hospital.
I guess Do You Hear What I Hear was a bad song choice!

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware