Hey all, This might be a goofy question, but here it goes... On the Demeter HBP-1 or VTBP-201S there is only one volume control to speak of. I have been accustomed to a gain knob and a separate volume/output knob on just about every amp I've had so far, so I'm a little confused. Does the Demeter have an automatic gain level that I don't know about or does the volume knob control both the input gain & output or what? I'm seriously considering one of these two preamps & I wanted to get the skinny before I made a move. Thanks!