Try that treble trick; you may like it. IMO, it changed the other controls' DNA big time.I can verify this... It took me a good while to learn how to dial in my Mesa Roadster. I had a night that I got out in front of the band and absolutely hated the sound of my guitar and haven't gigged the Roadster since. Some day I will get back around to messing with it. It has been setting idle for a good handful of years now. I had thought about selling it because I have a few other amps that I tend to gravitate toward. My whole issue is how the controls interact with each other. I am a little impatient and don't like it when I get something dialed in then make one little change and lose the magic I had.