Val, what are the styles? You really shouldn't need BIAB to share and collaborate. For example, I played electric guitar for one of OCC's tracks and I didn't have any PG products to deal with.

All that you need to do is export an audio file of the various songs. The vocal talent can then load in that audio file of whatever DAW they are using, then they can record the vocal track(s) and then provide those back to you in audio format and then you mix them together.

I've been to Otter Lake many times - used to camp at a church camp in Otisville, right down M-15.

-Scott