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The original source for this was from Bob Schleicher's Electronic Instrument Service website, tonewheel.com. It is gone, but has been 
archived on the Wayback Machine. The archive includes the tonewheel.com 
Services and Schematics web page, in which a link to the schematic of the AO28 effects loop can be found.
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the other authors of the content, whoever they may be.
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