I have a track that I made with a synth patch that I've lost and am unable to recreate by ear. I read somewhere that it is possible to single out a sound if you have one track with the sound and one track without it, how do I do this?
Invert the phase of the track without your target sound and then mix both to mono. This will subtract the unwanted sound from the overall mix and should leave you with the sound you want. This is all of course assuming that both tracks are phase-coherent and sampled aligned.