I've had Prosonic heads & combos for years. Until recently I've never used input #2. If only I had enlightened myself on this years ago. It's almost like having a different Drive channel. I usually fought the high end in input 1 with the gain channel. I'm not exactly sure what Zinky did, but it is much warmer than input #1. These amps are beyond loud so a little drop in volume is not a problem.. I still love the tone on input 1, but this gives me a tamed version of the drive channel which I've always wanted. It's a big giant Duh! for me..