I am trying to design a Wah Wah effect for guitar using the 1701 evaluation board. The textbook I'm using shows a signal flow graph that has a time varying band pass filter with variable center frequency. A direct mix of the input signal is summed with the input going into the filter. I have tried to use the ADC 3 potentiometer and a VCO into the filter, but this doesn't change the frequency. I've tried to search for other posts, but I don't think I've found anything. So is it possible to use the potentiometer to vary a filter's frequency at all?
Thanks for any help. I can provide the graph and my program file if needed.