This i found as a scan from some ye oldee electronics magazine. I have no idea what it does, but text from the article made me draw it :)
Excerpt from the article:
Fuzz, echo, reverb, big bass, they're all out! The new guitar sound is funky, and you'll get that with the wide range funk box. Just crank potentiometer R7 (range) and you'll get an extra twang from way down low to way up high.
Adjustment is easy, simply vary potentiometer R4 (trimmer) until you hear a whistle (oscillation); then back off R4 until the oscillation just ceases.
Attention! Madferret verified this and he noted that it is a reasonable wah with range pot acting as a wah pot. And you shouldn't use your girlfried as a knob turner in the long run.
Also. It may be a good idea to wire a 10K lin pot external instead of the trimmer.
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