I see that the Bart preamp can be used with a 3 way toggle for mid selection. Would it be possible to use 3 different mid pots (1 for each position) instead of the toggle. This would be if I used the 3band preamp as an outboard preamp. I wouldn't want to fit that many pots on a bass. side note: any reason the box for this couldn't be made out of wood? Easier to build than a metal one.