Random resistor value

[ryder17]

Hi all!

Im trying to build a pedal with a filter that fluctuates slightly every time you turn it on. To do this, I need to find a simple circuit that can change a resistance value randomly. Do any of you have an idea of how this can be achieved? I'm thinking a circuit that can send out a random voltage to an optocoupler would do it, im having a hard time finding a circuit to give out random voltages. Can anyone point me in the right direction?

Cheers

[Beaker]

Like a Maestro Filter Sample and Hold/ Oberheim VCF Filter?

[ryder17]

Possibly like the sample hold part of the maestro. Aren't sample hold circuits quite complex though? I have the filter I want to use, I just want small variations applied to the pot bacically