Discovered that one of my old overdrive pedals, which was a Zakk Wylde signature model has a built in switch on the circuit board. Turns out that turns it into an MXR Classic Overdrive. Instead of the metal leaning type of drive it originally had, it turns it into more of a Tube Screamer type of pedal.
Very cool. Had a lot of fun with that, but it still won't replace my Airis Effects Savage Drive, as that pedal absolutely kicks ass.