Adding external channel switching to pedal

Grubb

Well-known member
One of the builds I'm planning out and is the 3 Revv clones in a 1590DD with intelligent relay bypass switching on channel mode to give me a 3 channel chugga in a box. What would be really handy for full integration into my rig would be the ability to change channels externally like an amp channel switch or the like. My other gear can send amp switching signals. How would I go about adding this functionality to my build?
 
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