Hi Simon...
What I do is compose my song in BIAB. I then go into Reaper or Cakewalk and insert a "virtual instrument on new track" I choose the PG Music plugin. This creates a track in Reaper called "BIAB DAW VST3." I open the song I composed in BIAB within the plugin. When it loads I then "generate" the song in the plugin, and it does it*. All the tracks are midi in this case - except the "real drums."
I then drag all the tracks into Reaper using the "All" button on the plugin. I have dropped them ON the first track that was created when I first inserted the plugin. It didn't work.
I have dragged all the tracks using the "All" button on the plugin and put them UNDER the track that was created when I first inserted the plugin. Tracks set up nicely and the meters are moving, including the track that was created when I first inserted the plugin, but no sound. I've made sure that all "record monitoring" buttons are set to "on."
I've tried bringing in one track at a time (as if that's going to make any difference) and end up with the same results.
If I bring the tracks into Reaper as wav files, everything works fine. But I do know that a midi track has a different set of rules than an audio track.
I should say that I'm having the same issue in Cakewalk as well. The only difference is that when I drag all the tracks from the plugin into Cakewalk, 30... yes, 30 tracks are created. Dunno what's going on there.
So I know it is something that I'm not seeing, doing, or probably even understanding.
I'm hoping that I've been able to explain myself in a somewhat coherent way. If not, let me know what I missed and I'll get back to you.
Thanks so much!!!
/Bobby