Hi Dud,
you said that you have an old version of Cubase, right?
So you simply launch Cubase, then LOAD your midifiles (or whatever they are) and SAVE them AS midifiles 0.
Your G 800 should then be able to read them.
Regards
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.