Hi all, new to BIAB. How do I do the opposite? I have vocals in Synth V and want to create an instrumental track with BIAB.
render the synth vocal to audio and then import or drag it into the audio track. Be sure to set the BPM of the vocal into BB first. You only need to set the first beat of the synth vocal properly in the BB ACW (chord wizard) to line it up properly so it syncs with BB. Then you can build the chords easily as the vocal track plays. I've actually used this method a few times when all I had was the vocal to work with.
Another way is to learn the song and create the BB backing tracks, move them all to a DAW and drop the vocal in aligning it to the music. I have used this method as well.