I'm going to build a Ruby mini-amp from runoffgroove.com and was wondering if it was possible to add a 2 or 3 band eq to it. I'm interested in bass and treble control, but was just curious as to how much time/work/effort it would take and exactly HOW to do it. I seem to recall reading something about a Ruby with a Big Muff tone circuit in it, (never having used, or seen, a BM) would that be similar?