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you could use a 555 timer like this: simulate this circuit – Schematic created using CircuitLab


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simulate this circuit – Schematic created using CircuitLab This should be about right. If you don't have 1V available directly, adjust C1 accordingly.


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If this 'resistor' is in a feedback pathway, the ADG1611 should do the trick. With leakage in the nA range and cross capacitance between channels at ~100pF, it should affect your audio signal very little. It also has very little charge injection when switching (which would reduce 'pop' noises). It does vary resistance (because it contains a PMOS and NMOS ...


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