[I realize that a micro-controller is not meant for audio processing]
I've wrote a simple program to do an analogRead and then pass that value to analogWrite. I expected to get a lo-fi version of input. I also tried to first divide the analogRead value by 4 to keep in in the range of values that analogWrite can output.
Neither gives me what I expect.
I get a lot of noise and a constant tone through-out.
Should this be working?