I am hoping @DaveRat can chime in and maybe help out the digital world of mixing concerning this issue. Maybe he can hookup his techy gear and meters to see if there is a calculated threshold, that must never be passed before feedback will occur through the applied effects. Hello, my name is Dana and I have been recording audio for 45 years. I am the owner of D & L Studio LLC located in Honaker Virginia. Audio is fun! Mixing and mastering is really quite simple once you learn the basics. After that, it can only be enhanced by gaining experience. Gaining experience comes from doing! If you would like to learn more, please visit https://danatucker.com.