Hello,
I recently made a distorted profile of my 5150 II amp and it came out great and holds up well at high volume. There is one problem however, the guitars I have all have EMGs except one which has Seymour Duncan Blackouts. The guitars with EMGs are quiet as a mouse even at high volume but not the guitar with Blackouts. As soon as I turn up volume knob at high volume it feeds back. It's only happening on this profile. Has anybody out there experienced this issue and if so know how to resolve?