I spent understanding now how high-impedance inputs can have noise problems, and how to reduce those by isolation. That didn't have any impact. I also looked closely at what I was setting my gain to (near unity), and realized that my estimates on the pickup voltage levels were way too low. So I think I don't actually need nearly as much gain as I thought I did. I tested this by just running the pickup through the output stage, and seemed to get good results. I'll run it through the four-track tonight so I can listen more carefully.
While this makes the final amp substantially simpler, it also excises my solution to the tone problem. Perhaps I'll have to stick a conventional second-order filter in.
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