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Well I guess I'm presuming there are tracks and a mix in some sort of software, or it's going to be hard to just slide new vocals into part of it. I use Audition at home and can use Garageband/ProTools/StudioOne in the studio I'd be recording in, but I can probably figure out how to convert from anything else as well.

I do have a Garageband file if that's helpful. My music production skillz/knowledge are super basic. I'll send you an email later this week so I don't have to torture the masses on this thread 😝