I've been enjoying inputing tunes I am learning into IRb to allow me to practice against them.

Most of the tunes are easy to represent in IRb, but I'm having trouble with one in which a few of the chords are synchopated.

The tune is in 4/4, but in one measure, the first chord gets three 8th notes, the second chord gets three 8th notes, and the third chord gets two 8th notes (and then the next measure is the same chord as the last chord of the previous measure). In BIAB, I would do this using what they call "pushing" the chords. I don't see a way to do this in IRb.

I've tried changing the time-signature for one or two measures (e.g., to 6/8 or 12/8), but haven't succeeding in getting that to work.

Any suggestions?