Sorry, but it is not possible to get the sounds of the VA-7 into a Korg 707. The 707 has only ROM (read only memory) and cannot accept new sounds except thru external ROM cards (limited production cards produced by Korg) inserted into the 707.
BTW: I remember the Korg 707 quite well. A cool retro futuristic (space age) looking portable unit great for travel. I spent a summer in Hawaii (1990) composing and playing on it. Fond memories.
[This message has been edited by Scottyee (edited 11-01-2000).]