Tone control in preamp circuit

[Richard Banks]

I'm building an audio preamp pedal intended for use with an
electric guitar. It is a distortion effects unit that
uses multiple stages of opamps to increase gain that will be
clipped. What are some ways to ask tonal control to the circuit?

I tried a 100 pF cap in the feedback loop of the last stage in
series with a 1 meg pot that was supposed to give me some control
over the 100 pF flow and thus tone control. But this did not
work. When the pot is increased sufficiently it should put
that network almost out of circuit shouldn't it?
Could it be that I should increase this to maybe 2.2 megohms,
due to the high gain (about 1700).

Also, would it be wise for me to filter the output of each stage
before sending it on to the next? I'm using 0.47 uF caps for
reactance filtering on only the audio input lead and output
lead at the moment.

Any help will be appreciated. Thanks in advance.

- Richie Banks

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