Thanks for the prompt reply Jim, I'll add some info that I should have put in at the start

I am running BIAB 2021 Ultra on a Win 64 platform and my DAW is Reaper.

I tend to do things the hard way just because :-)

When we build a song in BIAB I generally export the drum track as a midi file so I can break the kit up into it's separate pieces, kick, snare, toms, cymbals etc all on their own separate tracks in my DAW, the rest of the instruments are exported from Realband into the DAW once again on separate tracks.

I do sometimes export one of the other instruments as a midi and change from maybe finger picked guitar to a viola / cello or perhaps keys, I have also exported a piano part as midi and broken it into left and right hand to accentuate or remove what I don't need in the mix.

This gets us the band we want playing what we want without having to do all the midi stuff long hand or employ a bunch of session guys.

I was hoping to be able to swap time sigs and styles in the same manner as we can by clicking on a bar to change the colour from clear -> blue -> green etc.

I'll keep diving in to see what I can find and keep coming back for more.

This is a couple we put together
https://julierichards.bandcamp.com/releases
https://nevertoolate2.bandcamp.com/track/fun-in-covid

Regards
Dave King