Currently it appears that - VERY UNLIKE A REAL VST PLUGIN - do play back the BIAB backing part and process the tracks in a DAW - one has to drag and drop the individual regenerated audio onto the DAW track. And this has to be done after any change to the BIAB song arrangement.

I gather an alternative exists where audio from the BIAB plugin engine can be played back through the same audio driver (and thus interface ) as set up and used by the DAW... but no means of just outputting audio - whether mixed-down to stereo or separate multi-channel audio - to the stereo channel of the BIAB plugin itself - or some other multi-channel routing in the DAW.

Please PG - when you finally get around to releasing an OSX version of this - where there is some very bog-standard expected behaviour for how an AudioUnit plugin instrument or VST instrument or MAS instrument or drum machine is supposed to behave....
........ please make the BIAB plugin have the normal expected behaviour of an audio plugin.

Being able to just drag and drop individual BIAB instrument tracks into audio tracks in the DAW is a nice-to-have. but if one has to keep doing drags and drops EVERY TIME one makes any change to the chord progression - or changes style - then this drag-and-drop business
is just a workflow-hampering pain in the neck.

So instead - do the right and proper thing when an OSX version of the BIAB plugin is released in -2019??- and code your plugin so that it can output - on choice - either a STEREO master-mix audio stream - or a MULTI-CHANNEL output for EACH backing instrument and track in BIAB.

This is the expected behaviour of a plugin.

Not the fudge KLUDGE - half-arsed attempt that the Windows version has right now.

Isn't the idea of a BIAB DAW plugin meant to be to speed up and simplify workflow?

Make it so.

MacOS Sequoia, M4 Pro Mac Mini , 64GB RAM 512GB SSD ,
BIAB, Cubase, Ableton, Logic Pro, SCALER 3, GigLad, AnyTune, Synthesizer V Pro,Vienna Ensemble Pro, Audiofuse, Fractal FM3, KOMPLETE 15, StreamDeck, iReal Pro
White beard, beer belly, bald patch