I asked this question to Mr. Fargen, but he was either reticent to answer or didn't feel like explaining - bad customer service for me I'm sad to report. I was really disappointed to get that kind of response, because what I always appreciate most with great boutique makers is that they are always happy to elaborate technically on their amps, which I had purchased or was in process of. So, I'd thought I'd bring this question to TGP: Can someone please lend some insight into the "Decade Switch" that gives 3 different classic sounds/gain structures on the MiniPlex. Is this achieved via various cathode bypass caps? What is going on technically in detail with that feature? Thank you.