Just got my Grand Prix in the mail, and I love it! I was reading the manual, and it says something like: If you want intentional tube distortion, boost the input, but make sure the light for +20db only rarely comes on. well... I've just been cranking the hell out of the gain, boosting the bass, etc. to get a wicked saturated tube distortion. It sounds fantastic, but the +20db light is fully on. With the light just flickering, I don't really get any distortion at all. What gives? Am I damaging my preamp? Hope not, 'cause those are some wicked tones coming out. Thinking of getting a booster pedal to up my gain some more and make the option more gig-worthy.