This will be easier with dedicated MIDI song select options as well as once the Aeros is able to act as Master which should not come long after we expand MIDI.
Currently, the easiest way to use Aeros and BB is with fresh unrecorded Aeros songs since BB sends time signature and tempo to Aeros making it very easy to change BB songs to a new Aeros song.
We understand this is not how every looper performs and many are using the Aeros as a recallable sampler, and we dig it and we want to support that kind of looping on the fly, too, in due time we definitely will be able to make it better.