You generally have to do a little searching for sound data, especially with newer instruments. I'm not sure if these folks offer N1 sounds yet, but several are VERY likely to do so eventually, especially kidnepro. You can try these outlets:
Korg.com
manymidi.com
patchmanmusic.com
greytsounds.com
kidnepro.com
In addition, you might have some luck contacting Keyboard magazine's editors @
keyboardmag.com. They often have insider-type
info that can lead you to otherwise obscure
access points for such goodies as the software you mentioned. Some places will even arraneg to download it to you via the Net. Good luck, bud!