I am trying to build a LFO circuit that produces a wobble bass effect.
My overall plan is using an Op Amp to create the LFO and another Op Amp to create the low pass filter. How should I connect these two stages? I know that the LFO part will output a square wave, but how do I use that wave form to change the cutoff frequency of the low pass filter?
I know that the easiest way to change the cutoff frequency is to change the resistance, but how do I achieve that with the out put from an Op Amp LFO?