I was thinking it would be cool to have feedback on GTR3.
Don’t know all the proper terms, so please bear with me.
There has to be some physics to feedback which could be replicated and toggled on and off.
And since the monitor tends to emit a signal that goes through the pickups, maybe that could be the axis point, as if the monitor was the speaker.
Those are my brief ideas so far.
Would be open to brainstorm or discuss if possible.
Have a great day.
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You do realize how old GTR3 is? You’d have more chance with the PRS SuperModels or the Voltage Amps, and when I say “more chance” I mean none 
I don’t mean to be negative, but that is my honest opinion.
There is a 3rd party plugin that does similar to what I believe you seek, I can’t recall it’s name or who made it, I believe it is something like the old BOSS Distortion/Feedback or Feedback/Distortion pedal or something. I had one, it was truly hideous 
Good luck with it anyway 