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Boss SD-1 Modified by Dave Schwab, to my knowledge. I received this pedal in a gear exchange with a good friend years ago, this was in the bundle. I was amazed, so I borrowed a stock SD-1, and there's a big difference to my ears. Extended low end, a slightly extended high end, more pleasant midrange. Can get cleaner than a stock SD-1. JRC4558 chip in a socket, so if one would like to swap chips you can. Jamicon capacitors. Blue LED. It's truly a big upgrade in tone from a stock SD-1. Never gigged. Never on a pedalboard. Continental US only. Any questions or additional pics, please ask. Many Thanks
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