i really don't know what's he doing with the volume side, but it remembers me on that staccato-pedal discussion.
i recently isolated my volume antenna with that flexible braided nylon tube tw member bisem once has mentioned, works perfect and looks sexy. now i can squeeze the volume antenna with two fingers and produce some similar quacky staccato sounds. but the better pitch range. it's sooo tiny. i hope it's expandable.