Hi all, I'm new here and this is my first amp build. I'm trying to keep this build pretty stock, but I'm a little confused by all the volume pots. On the layout I see a PI Master Volume, Preamp Master Volume, and a Bright Volume. Is the Bright Volume pot replacing the bright switch of the original Micro Bassman? If so, could I covert this to a bright switch? If I needed to put one if these pots in back of the chassis (kind of a set it and forget it), which one would you choose? Is the PI Master Volume, the final "master volume"?