Yamaha DTXpress/DTXplorer/DTXtreme

I'm pretty new to the DTXpress, so this may be quite simple.  I'm 
trying to connect the sound module to Cakewalk, and I can get it to 
work fairly well, but I'm having trouble with certain kits (namely 
32,33,36,37,38, and 39).  When I go select these kits in Cakewalk or 
on the actual unit, the module starts to display kits in rapid 
succession then defaults to a GM kit.  I was also wondering if there 
is any way to access the individual drum patches (bass drum, snare, 
etc.,) from Cakewalk, in order to gain independent volume control, 
and to mix kits quickly.  Any help I can get on this I will very much 
appreciate...by the way, props to the creator of this site, it has 
been a massive help in learning the in's and out's of this particular 
piece of equipment.