Relative newbie here.

I have a vocal track that when played back in Band in a Box is not syncing with the accompaniment - by about a half a bar.

When I export the song into RealBand the audio syncs up perfectly, suggesting this is NOT a latency issue.

Running Win10 and BiaB 2023. Focusrite Scarlett 2i2 interface.

I have tried rebooting (but not reinstalling since problems are limited to this one song).

Have searched the forums with no success. Most common answer to similar problems is latency.

Song was originally recorded at a faster tempo. Slowed tempo about 10bpm and re-recorded the vocal. It is almost like the vocal track is trying to sync to the old tempo, if this makes sense?

What might I be doing wrong here?