I'm doing some experimentation with my amp, and recently got some advice that I find puzzling. Someone has suggested that I should leave the master volume up all the way all the time, and adjust gain with the volume controls on the preamp and the bass itself. I've heard you can/should do this with separate power amps (although I don't know why), but what about all-in-one heads. FWIW, I'm using a Peavey T Max amp. Any thoughts/suggestions/explanations/recommendations? BTW, I searched the threads for this and didn't find anything -- if I missed it, please direct me to the appropriate thread. Thanks.