As Roland suggested, the Prototypes might be a good place to start your search for a Sound you could modify for Pen/Tablet control. For example, if you start with the SphericalPanner QUAD prototype, in its X, Y, Z parameter fields, you could replace !Position.x with !PenX, !Position.y with !PenY, etc.
If you start with the Prototype MultichannelPan XY coordinates, in the CapytalkToSound modules, you could replace !Position.x with !PenX and !Position.y with !PenY. Then you could use the CtrlByHand button to switch between an automatic pan and the X,Y position from the tablet.