After letting it sit as partially functional over the weekend, I looked through the schematic and checked one of the electrolytic caps that would effect the "FREQ" setting. Sure enough, the lead was broken inside the cap, probably from changing out the pot. I put a new one in and it sounds great. The FREQ does a great sweep from pronounced high end to house rattling low-end. The Q fine tunes a lot of things. I went from being bummed out about the limited EQ possibilities to being really impressed. We're using it to level things out and boost the low end between an electric bass and a double bass with the same amp. It definitely helps even everything out.