Hi, This is Andy.  My partner, Duance,
and I  have developed a software interface for touchpad for our EE senior
 project.  Our software interface was
to  provide the PD user with the capability to use the features of a TouchPad
in  his/her audio algorithms; these features included real-time control of
three  separate parameters (x, y, and pressure), recording/playback of gestures,
and  triggers for tap zones, mouse buttons, and gesture recognition. The
gesture  recognition used a Hidden Markov probability model. 
   
  
   
  Andy Chen