I want to build a footswitch that I can use to operate Ableton Live 9's Looper device. The device is designed such that one button controls most of the essential functionality. My idea is to build some physical object that will receive some kind of physical impulse — any impulse, not a midi controller message — and then use Max to convert the impulse into a midi note that can be mapped to the Looper button in Live.
I'm playing with the idea of repurposing a USB keyboard to do this, but does anyone have any other ideas? Maybe a way to do it with audio cables? (Ideally the design would be such that it could later be expanded to provide multiple midi notes in the form of multiple impulses that can be individually recognized by Max.)
I want to do it this way so that I don't have to get into circuit-boards-and-solder midi hacking, since all I really want from it is a way to turn a foot-stomp into a mouse click.