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by indiegrab_360
I once recorded a project where I'd record the guitar parts, but afterwards keep the mics up and record crazy feedback over playback, just seeing what kind of feedback noises I could create with the guitar parts matching (so the tonalities are on the root notes of the song structures). Pretty useful because you can layer the feedback during mixing. It sounds good (to me) when you automate the feedback with panning, although some might find that cheezy. It's done on a lot of Hendrix albums.
I also remember I also achieved the feedback equivalent of "Terminal velocity" where it basically just sounds like really unpleasant vibration/ripping sound that will certainly peak out the mics. I guess if you have nice stuff you'd want to avoid blowing out your mics if possible. Best to read up on the specs of the mics and figure it out. Pretty sure many dynamic mics can handle crazy amounts of dB so some maxed out guitar amp feedback, as unpleasant as it is, won't do anything to your mics.