I've spent some time searching the archives to no avail. Can someone explain the relationship (and ideal settings) of the Volume, Boost* and Master on the older 400RB heads? I'm not entirely sure where to set these controls and have a hard time discovering any no-no's with certain settings - bad example being: input VOL at full, Master for loudness - just the opposite of what I'd do). Conversely, should Master be near full and input VOL for loudness? Is the Boost additional Volume or does it mess with the EQ as well? * FWIW, I won't be using a pedal on the boost channel. Thanks for any advice.