The MXR Classic Overdrive is known for having an internal dip switch. One side is the classic GT-OD 808 style mid boost OD and the other is the more balanced Zakk Wylde OD. Its always bugged me that the switch was so unaccessible as you have to disassemble the entire pedal to get at it, so I decided to mod it by installing an external switch. I documented the process of the mod.
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