[plumbweiss]

There are people around who make shellac-coated books for playing fairground organs. They generally have a foot-operated punch and use a folded thick card which is sprayed or painted with shellac after punching to make them hard, as the organ keys are strongly spring loaded fingers and the cards have to be repeatedly played without wear. Maybe worth aproaching them ? And how about fitting the HST with a socket for an interface to a digital relay output card from a PC? You could link this to a valve database and Im sure it could be done discreetly? They do this with fair organs too!!