Yamaha DTXpress/DTXplorer/DTXtreme

Phill,

You can certainly use the DTXpander on a 3 zone port to use 3 mono
pads - there is a circuit in the files section.  The only difference
is the extra transistor and a 10k series resistor in the rim switch.

The expansion capabilities of the DTXpress IV are a little different
to the earlier versions.  On the DTXpress I, II & III all inputs were
dual zone with some 3 zone, and hence quite a few were unused - eg the
toms were usually used as mono inputs, wasting their rim switch
capability.  However, on the DTXpress IV the tom inputs are only mono.
 Overall, you get 12 inputs though, compared to the DTXpress I, II &
III which have 10.  On the DTXpress IV you have nine mono, two 3 zone
& one dual zone maxing 17 zones in total. On the DTXpress III you get
2 mono ones, three 3 zone and 5 dual zone, making 21 zones in total (I
think!)

Keith.