Schumann Lion

Here is a layout for the rare Schumann Lion distortion.
Original brief description:
"The LION is a distortion device and a clean booster with two complete circuits that can be mixed independently.
Has a bypass footswitch and boost footswitch that gives extra distortion.
Great for bass -- distortion that doesn't cut out the low end.
Great for guitar -- minor chords retain clean harmonics -- you can get great distortion but still hear definition of notes."
You can find original DIY thread and schematic here.
30/11/2017 Layouts Updated! Changed Drive pot to B1M and added 470uF capacitor.

If you want to use Mark's Bipolar Voltage Converter:

Schumann PLL

This is a layout for the original 12V AC version.
There's also a +9V DC schematic but it has never been verified.
You can find all the explanations in FSB and DIY

Layout Updated!
"Con" Switch added