More info: this is a Real band problem only. I can generate real drums and real tracks in BIAB and it follows the tempo changes correctly.

I used the same example above. I opened it with BIAB and generated the same real drums and the same acoustic 12 string in BIAB and it worked flawlessly.

I then saved the song from BIAB and opened it in RB. the acoustic guitar and real drum tracks were there, but they do NOT follow the tempo map in RB - they follow the original tempo ONLY.

I do not save the file, I open in BIAB again and it works perfectly.

so I have a work around - but it's not working like it's supposed to.

rharv - what do you mean by "doing the +/- change over?" or "erase +/-"?