Yamaha DTXpress/DTXplorer/DTXtreme

Hello everyone!  I just bought a floor demo DTXpress from a Guitar
Center in Austin TX a few days ago.  It didn't come with a manual. 
Fortunately I have been using midi for a long time and was able to
figure most of it out with trial and error.  This is my first kit and
i have to learn everything, even how to hold sticks!  I was relieved
to find this group as the archive shows that some of my problems with
the unit (touchy hihats, bizarre program changes when connected to a
sequencer and that it sounds better with fat sticks are not problems
peculiar to my unit.  

It sounds great when played without my sequencer.  However, connected
to Logic Platinum I am getting "trigger noise" with each hit. A
little buzz.  It doesn't appear to be a midi loop as I have local off
set, like a keyboard would.  Any ideas?

2nd question--can i use the "dual" pads with the DTXPU brain?  Like
getting a Roland V drum just for the snare?  

3rd question--Given that the answer to #2 is yes, has anyone tried
rigging up a stereo "Y" adapter to the trigger inputs and thereby
running two "mono" pads off the same trigger input?  Does that work?
I am so used to having more sounds immediately available i already
want more pads, and it seem like I could add quite a few more if this
worked without getting another brain.  

Many thanks!  I will be uploading some kits soon.  Though i am new to
e-drums, I am used to MIDI--go check out my site at:

Rich The TweakMeister
http://www.tweakheadz.com