By cutting a small disk of piezoresistive fabric with a central hole I retrofitted a higher resistance range pressure sensor into the Sparkfun clone of a Monome pad.

Pressure sensivie Monome Retrofit

THe Monome (http://monome.org) interfaces are square arrays of illuminated switches interfaced over USB using OSC messaging.

A large part of the desirability of this interface is the tactile quality of the buttons which comes from careful design of the silicone molding. Each button has a ring of conductive rubber attached to connect with a circular array of interdigitated contacts. The conductivity of this connection does change with pressure but the conductivity is so good it is hard to measure the change accurately.