I got some unexpected available time so I ran some experiments. Here is what I found:

1- using both versions 912 and 914 I changed instruments and the change worked as expected. BUT I reread you message and found out that you had a melody track whereas I didn't in these experiments.

2 - using only version 914 I changed instruments but they did not change! They stayed the same sound even though the track IDs changed. The melody track was not affected like in your case.

Note I mostly work in MIDI and all of these experiments were MIDI only with no frozen tracks. Also I tried the above on 3 or 4 different existing songs and the results were always as stated above.

The conclusion is there is a bug in 2022 BiaB version 914 and maybe other versions. You may want to report this to PGmusic and reference this thread.

Like Dan I get out of BiaB as fast as I can. I do all of my instrument changes in my DAW, Studio One Pro 5.

(edit) would others please try this and report what you see. Thanx!

Last edited by MarioD; 01/02/22 09:26 AM.
Whenever I get something stuck in the back of my throat, I dislodge it by drinking a beer.
It's called the Heineken Maneuver.

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware