Got a request for this one. The schematics that come up with a Google search are all wrong apparently, but it looks like the good people on FSB have figured things out. Here's a link the the discussion and the latest schematic (which this layout is based on) is on page 5. I based this layout on the original layout from MXR, using 2, single op amps. Early versions used the 741 chip, but you can use TL061 or 71s if you want.
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