Some of the better sound people will MIC the front of my amp, then go to MIC the back. Instead, I have them plud into the XLR Out on my Kustom. Same thing in the studio.
Many of the sound people will turn everything up, until it feeds back, then back off until it only feeds back a little. I don't know if they are all deaf, but I can still hear the feedback. I unplug their MIC and plug the cable into the XLR Out. At least it stops the feedback.
I have an Egnater R30 that I plug directly into the house PA and it sounds really good. It works well in that the amp is designed to see a speaker load w/the silent record feature that eliminates any stage volume.