Yamaha DTXpress/DTXplorer/DTXtreme

Hey all,

Does there exist any software to edit a DTX(press) drum kit on the 
PC? For example, you download the sysex, then open it in a program to 
edit it on the PC, save it, then send it back.

If it doesn't exist, would anyone be interested in such a program? Or 
do you feel it is easy enough to edit on the DTX(press) and such a 
program would be useless/not used/not needed.

Bill