If you render the song to a WAV file, and then make any change to the BiaB song and then play it, the original WAV file you created will play along with the new/changed song.

Could this be what is happening?


BIAB & RB2026 Win.(Audiophile), Windows 10 Professional & Windows 11, Sonar Platinum, Cakewalk by Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, NS40M Monitors, Pioneer Active Monitors