I’m a few years late in this post, BUT, I have questions that are very similar to yours. I use BIAB as my backing band while playing my Mason and Hamlin piano. I use BIAB “songs” from Norton Music which he has produced from entire and various fake books. I frequently modify them slightly and away I go.

My set up is Mackbook Pro 2021, to a small self powered mixer via the headphone jack then to speakers which are not self powered. I recently purchased a Focusrite 212 3rd gen. I’ve hooked it up between my mixer and speakers. I don’t seem to be able to tell much difference in sound quality.

I’d be interested in your comments.

Thanks,
Bud