Yamaha DTXpress/DTXplorer/DTXtreme

> OGD, our resident electronics surgeon, must be sleeping in today. 
> Otherwise he'd be all over this question. He probably knows why both 
> connections come into play.

Well, I have just had to take mine apart then.  

There are four "zones" and the force sensitive resistor progressively
shorts them out.  Three of the resistors are in series and
progressively shorted out with 1k always in series.  The resistors are
10k, 47k and 150k.  This means you get 1k, 11k, 58k, and 208k
approximately.  I am still puzzled by the tip of the plug.  It has a
150k resistor in series and seems to detect the bottom of the stroke,
but will give higher resitances at other points.  There is also a
diode and resistor across the 1k in series with the ring.

Kkeith.