So here’s the question: I have created a click track for a song that was recorded in 1977. At first, the click is with the music. Soon afterwards, the tempo for the music starts to move from the click.
What would be the best way, if possible, to get both to lock in?
If you assign a MIDI track and create clicks to follow the tempo, you can then render that as an audio track and send it off. Pick a somewhat neutral but “high” sound as the click. I’ve done that a few times. Just make sure that track starts at the very beginning of your session, and that the musicians also align it to the start of their DAW session. When they are ready to send you audio tracks, have them render their audio takes from the beginning of their DAW session, before sending them in, so you can drag and drop them into your session, already lined up.