Yamaha DTXpress/DTXplorer/DTXtreme

Hello, I don't know if you guys have heard of a drum simulation game called 
Bandjam, which is like Drummania on PS2. I know its possible to hook the 
DTXpress up with the computer to play the game (i have all the cables etc) and 
everything should be working, but i still can't connect it to to the game...
Or is there a controller that can let DTX trigger keystrokes on the computer?
Any help here would be appreciated, the bandjam website is www.bandjam.net, 
but its in japanese.