http://www.analogman.com Let's take a listen to these Analogman modded Boss pedals. This video focuses on the BD-2, SD-1, DD-3, and GE-7. We modify the Boss SD-1 Super Overdrive to basically Ibanez TS-808 specs, including the chip. Toggle up - Ibanez style symmetrical clipping. Toggle down - louder, crunchier Boss asymmetrical. This BD-2 mod does not drastically change the circuit, but replaces many cheap, poor sounding components that Boss used. The tone control more useable and less shrill high end. The Pro mod is designed to improve clarity and lower the noise issues that the stock GE-7's have. The DD-3 (hi-cut) uses the same compressor/expandor chips as an analog delay.