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Based on the EQD Hoof traced by Kit Rae at http://www.bigmuffpage.com/Big_Muff_Pi_versions_schematics_part4.html
Like original pedal it uses 2 germanium transistors on Q2 and Q3 however Q1 is changed to MSPA18 for bigger gain and has blend circuit.
Thread on freestompboxes: https://www.freestompboxes.org/viewtopic.php?t=32611