Audacity is probably what I'd use for that.
I'd use chordify to spot the key if I couldn't hear it by ear, then I'd ask the AI on the formula to slow down, speed up, etc by which percentage to make bpms and keys match.
Chordify sounds expensive. So you don't think audacity would make it sound like 8 bit mario bros after it's does it's processing? To be fair I haven't used audacity in a huge while so I can't remember how it processes things anymore.
I use it to mix down my own stuff.
I'm happy with the results.
Funky tunes. Thanks for sharing them. Yeah that sounds more than fine.
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