I think you've answered part of your question by describing the normal behavior of BIAB. The message also refers to the need to regenerate a song each time you change it (except for the MIDI melody or soloist). Change a chord, add a part marker, change the tempo etc. and the song will regenerate even if you click on Play.


BIAB 2026 Win Audiophile. Software: Fender Studio One 8, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Fender Quantom HD8 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.