Hey, So for my first bass build I need some help with some electronics knowledge. I want to install an Aguilar OBP-3 with sweepable mids. A few things I am confused about - 1. The Aguilar OBP-3 wiring diagram option #8 states that one needs to use a separate pot that selects the centre frequency of the mids. For this they mention to use a DUAL 500k Linear taper pot. Isn't this the same as a linear 500k blend pot ? if not, can a blend pot be used (with a different wiring scheme) instead of the special pot aguilar mentions ? 2. Can someone link me to a resource where i can buy such a pot that will have a threaded portion long enough to go through the top of a Bass cavity. (NOT a pick guard mount) Is this the right pot - ? http://www.ebay.com/itm/500K-OHM-Linear-Dual-Taper-Rotary-Potentiometers-B500K-500KB-POT-ALPHA-/260944291487 3. Also, once I achieve this sweep from what they mention as 400hz to 800hz, can I somehow rewire it in a way that will give me a range from 200 or 250hz to 800 hz ? Their schematics show that with use of certain capacitors, one can increase the frequency range, but haven't shown that on the mid sweep pot diagram Thanks in advance.