Alright, I was explaining a little bit around harmonics and their application an a guitar to a guitarist I know. He's claiming that when you do a "pick squeal" where you just put your thumb down on the string before the pick to mute the string, you're actually playing a harmonic regardless of where you do this. He says that this is a harmonic because of "high gain" He wants me to post this to uh prove himself right. Can someone help me explain this better to him? Thanks!