Pitch shifting & Amplitude Modulating a Drum Sample with a

YouTube via isotopeofme
"In the interest of learning more about the electronics I use, I put together this simple beginners DIY electronic kit from Maplin. I modified it slightly, where there should have been a small condenser microphone I put in a wired input so that I can route sounds from the modular and computer through it. This is an example of the (ahem) high quality pitch shifting algorithm you can get your hands on for 10 GBP and what it does to a drum sample. This little battery powered gizmo pitch shifts up or down 3 octaves, amplitude modulates with a square wave and and has what I assume to be a ring modulation mode. Im using my Doepfer VCA to attenuate the signal. I put it together in about an hour last weekend but botched the job. This morning I went back and traced my error to ignoring the polarity on the LED and a diode. Unfortunately I think I fried the LED because its not doing what it is supposed to do. More on http://www.isotopeofme.com"