Hi Mike,

I tried it out on 2021/#822 and it worked fine. Here is what I did:
- created a song, 32 bars, 2 choruses
- used a style with 5/6/7 tracks (I added solo tracks to them)
- on bar 1, I muted all tracks except drums and bass
- from bar 5 onwards, I set one track at a time back to normal
- generated the track, played correctly in BIAB
- exported to mp3 (is that what you meant by rendering?) - and it also played ok

I am happy to give it another go if you tell me what steps to adjust.
Cheers, Paul