I play a Peavey Cirrus, which is 18-volt active, so I've always used the -15 pad on the input of the amp, but have been disappointed in the amount of volume I get from my rig (head + 2 4x8 cabs). When I plug my instrument in, I first adjust the preamp gain until the light just lights up when I hit a string pretty hard, which is what's suggested. I then use the volume knob solely for volume. Well, yesterday, I disengaged the -15 pad and adjusted the preamp gain the same way, and WOW, now that's a rig! Much louder and better sounding. My long-winded question is, is there something wrong with doing this?