OK!!!!!!!! no need to get arsey, you just didn't make yourself very clear.
IF you want the sounds of the XP80 you need to do it via MIDI...here is what to do.

1. press the patch button
2. press the local/tx/rx button and set local to off
3. connect you MIDI lead to the games port of your computer The MIDI out should go to the MIDI in of the XP80 and vice versa
4. put the XP80 into sequencer mode
5. select your playback MIDI device in Cubase to external MIDI
6. Connect your headphone jack of The XP80 to the line in of the computers soundcard
7. make sure the Xp80 MIDI channels are corresponding to those of the sequencers and make sure the linein isn't muted on your computer