As in, is 0 gain on a preamp a cartain voltage on ALL preamps? I am asking because I am confused how a hower amp know what level to play (as in, is no gain on a preamp always a given voltage, which is full-power on all amps?) I know this doesn't effect sould levels, just relative output on a given amp. To clarify. Is the preout output voltages the same at a given volume level (1/4, 1/2, full volume) on all preamps? Thanks!