Most people I've found building their own tap tempo switches for Boss products use the wrong switch and as a result have unusual and unwanted side effects to their switch. The problem stems from using a Normally Open switch that most people are finding at Radio Shack. What you need is a Normally Closed switch. Radio Shack doesn't sell any foot friendly, push-button SPST-NC switches, so you'll have to get them from an online store or a local specialty shop. Maybe some guitar parts suppliers have them too, I don't know. Note that this goes for other Boss products that use an external switch. My ME-50B also requires Normally Closed switches for proper operation, and I suspect that most if not all other boss products work this way. This might be what the polarity switch on the official Boss product does: one side is NC and the other side is NO. A potential part from Digikey that would work for this is 679-1023-ND. It's a "mini" plug, so it's barely foot friendly, but it will fit the bill. Edit: Turns out that there is a Mini SPST-NC switch at Radio Shack. They come in packs of four. They only sell them in mini size for some reason, so again, be careful when using your foot with these. But they will work, and since they come in four packs, you might as make double tap tempos with a stereo jack. The project box shown in the video could easily fit the stereo jack and both switches, although they'd be quite close together for your feet. Pardon the crappy video quality, I'm using ...
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