< -I have melody on all choruses but I mute it just before chorus #2 (in bar 32) and reset it in bar 32 of chorus #3 so it will play the lead in melody note into chorus #4. >

I did not have anything playing on the Melody track with the style I used on my test song. (Walkin.STY)

With your song saved, remove the melody portion of your song and regenerate to see if that resolves the issue. Walkin.STY has bass, piano and drums and I placed the synth and fiddle onto the Soloist Channel.

BIAB 2025:RB 2025, Latest builds: Dell Optiplex 7040 Desktop; Windows-10-64 bit, Intel Core i7-6700 3.4GHz CPU and 16 GB Ram Memory.