but when i L-R another artist (pro) track i hear weird artifacts. it is phase issues because of recording ? Of course I can attach an example. But who knows knows what I’m talking about, probably. some weird noises.
Check this video. I jump to another track to mine to another. When i’m on another track you hear that weird noise, when i’m on my track i hear my song.
Read that MAAT plugin manual. Diff shows difference between L/R channels. Your tracks seem like they’re in mono or you reduced the width quite a lot for some unknown reason, idk. So it doesn’t do anything while other tracks you reference are stereo mixes and Diff button does its work.