Roland TD9 Electronic Drums

Hi - Heres my UPDATE:
Got the Roland UM-One MK2 usb/Midi cable. Seems to work fine. Just a bit of a nightmare mapping the drums to my Roland electronic kit now.
I’ve tried recording midi drums from the Roland kit and using a midi file with some pre-recorded keyboard parts, however when i try to record playing along with the Roland kit, they dont quite sync up. Is this normal? i want to change the midi drum pattern already written, but use the existing keyboard parts to play along in time with. Any suggestions please? thanks
Al