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Check out access-electronics.com His GXR4 (or GRX4) switcher should do it for you. It allows A/B switching as well as other routing options, via midi. He sells a tiny midi footswitch to go with it, but it'll respond to any midi footswitch already out there (I believe). You can email Mario with your questions. He's bombarded, so be succinct. Also, he provides manuals for all of his gear. He is co-designer of the renowned Framptone A/B/Both switch that runs $350 bucks, but apparently the owners of it swear by it (see harmony-central.com/framptone.....not a direct link, by the way).