Yamaha DTXpress/DTXplorer/DTXtreme

It is difficult to know if your MIDI cable is faulty or if the drivers aren't loaded correctly without something else to check it on.  I bought a cheap USB-MIDI interface from EvilBay and it works fine (my laptop doesn't have MIDI).

I suggest you just use the MIDI monitor software and try to get some data out of the DTXpress when hitting pads first.  Then use DTXchange.  I have listed my DTXpress settings below:

UT MIDI RECEIVE
10PC=on
10=on
PC=on
SySEx=on

UT MIDI PC TABLE 
No=1
kit 40

UT MIDI SETUP
MIDI Mode=native
DevNo=Alloc L=on
Merge Output=off
DumpInterval=100
Send HH Ctrl=on
Host Thru Port=1

Obviously some of those will not matter but it should give you a starting point.  Assuming you try these settings and still cannot get it to work with the connectors either way round I would start to suspect the computer/drivers/cable.  Do you have a second computer you could try?

Keith.