As a guy that doesn't use real amps the ability to use feedback is at problematic, no volume, gain seems to help, but still it's still not a solution . Enter Digitechs Freq-Out pedal.But then I hear from others I doesn't sound like real feedback. oy vey! pick-pick-pick-pick- never happy, pick-pick-pick-pick-pick-! So I think hmmmmm Guitar- Freq-Out Pedal-T.C.Electronic Dark Matter distortion pedal- Strymon Iridium Pedal T.C Electronics hall of fame reverb placing the Freq-Out Pedal before the amp is how feedback occurs feed feedback loop starts at the guitars pick-up then goes to the amp , so place the in front of the amp,Digitechs Freq-Out pedal but it's to clean, to pure, so run the signal into the T.C.Electronic Dark Matter distortion, scuff it up a little then send it into the faux amp. it sounds much more realistic, but it needs just a little room reverb on the signal, because feedback is not happening in a vacuum. Ah that's better, much better! Mazol!