USB Footswitch ?
The Apogee Gio looks far too expensive if you only want to switch between three or four stompboxes.
I've seen the behringer, but that's not USB midi.
There are some Guitar Rig consoles on ebay. Does anyone know if these will work, as they are going for about £50 - £100 each, which is much cheaper than the GIO.
MacBook Pro