I built this as per layout and it had some issues. I had to change Grounded to Not Grounded Volume 1 to + side of 10uF cap going to NEW Boost 1&2, Change Boost 2&3 to Boost 1&2, Boost 1 to Boost 3.
Volume & Tone controls work as they should. Fuzz appears to be non adjustable.
Boost only appears to work in the last 1/3 clockwise direction and very harsh at end of sweep.
As per original layout when 9v power supply was connected, it just made thump, thump, thump noise.
Hope Zach can revisit as I went of his Trace layout on
http://guitar-fx-layouts.42897.x6.nabble.com/Top-Gear-Fuzz-Sustain-td31845.html page 2
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