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Hi, I would want to add a selectable mid frequency (like on Ampeg amps) by adding the RotoTone. In previous research I’ve found :
But the schematic is different than the ToneTweq and I’m having difficulties to identify witch is R2,C2,R1,C1 (in the formulas) from :
The present ToneTwEQ values of R7, C6, R8,C5 and the Mid pot form the Mid frequency band-pass filter which is centered roughly at 1KHz. If you adjust these values, you will shift the filter and overlap it with the Treble or Bass shelving filters. Experiment and let us know what you find.
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