I was just about to try out this technique on some drums I recorded recently.
tl;dr: The snare mic has too much bleed e.g. from the HiHat? Duplicate the track, inverse the phase on one of the two. These tracks now completely cancel each other out, resulting in bare silence. Now bring in a compressor on one of the tracks, tweak it until you’re happy. This will eliminate ~90% of all bleed.
But: Duplicating the track and inversing one just does not null the two out on my installation of Ardour. Instead, I got phase shift. Therefore I conclude that there is some latency issue here. Can anybody confirm this?
Copying or sharing the playlist both yield the same result btw., thanks!