Passive filter for Sansamp GT2 preamp kind of pedal. Based on Cesar Diaz (SRV technician) vibroverb tone stack.
Diaz replaced .047uF mid capacitor for a .022 uF. As a result the V notch frequency and depth changes, giving more mids.
The original Sansamp GT2 has a -36 dB notch at 700 Hz. This circuit has a notch of -16 dB at 550 Hz and also allows more bass
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