So I just got this preamp... BRAND NEW! But old. The instructions included seem kind of vague. The online instructions don't seem to match up with some things. Included: (2) 500k audio pots (center detent), a B50K pot (center detent), a pan pot, a 25k pot, a TCT unit, a box with green wires, a 30k micro pot, 2 cards with resistors and caps taped on. So basically, I'd like to know... What's the box with the green wires used for? Why does the one pot (B50k) have resistors attached? From what I can gather, I believe that the resistor'd pot was supposed to be a B25k, but they ran out, so this got replaced. I also guess that the A25k pot is the volume, after the pre section and before the jack. So another question is, if I wanted to run a passive tone control, can I do it? I have a stacked 25k audio pot, so I thought it may be able to be run post-preamp (oxymoron?), but wasn't sure. Any help would be very much appreciated.