"So I played it again in VanBasco and that was the time I observed that after a while the BPM changed from around 48 to 300 after a little while, and then up and down as the music played..."

Maybe that is your answer. If BiaB only picked up the 48 BPM then the fast original 300 BPM parts were played at 48 BPM, i.e. much slower. Thus every minute of 300 BPM would take around 6 minutes at 48 BPM.


I'm no longer allowed to go caroling at the psych hospital.
I guess Do You Hear What I Hear was a bad song choice!

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