I've seen a video of him performing, and I have some CDs. The "Foot-doodler" was a double bass, modified so that it stood up on its own and so that the strings could be struck by hammers, activated by foot pedals. He played a twelve string guitar, a harmonica in a neck harness, the footdooler, with one foot, and a top hat cymbal with the other foot. It all sounded pretty good too!