If anybody wants to make a wired remote, you can follow the lead of mergen3107. If you go around on garbage night or visit your dump you can probably find an old keyboard for free. Take it apart, there is a small PCB that connects to the big translucent membrance sheets. Just short any of the two contacts that connect there and see what keycode gets generated. Now, get a cigar box, tuna fish can or enclosure of your choice. Mount switches to it and wire each of them to the two contacts you find that work. You could also make a footswitch.
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