If you weren't already privy to these sites, store the addresses. Aside from whatever someone may offer as freeware on the Net through users groups or whatever, these folks offer good starting points.
kidnepro.com
greytsounds.com
manymidi.com
I don't know exactly what they may/may not be offering for the ns5r, but kid nepro in particular usually backs all the new stuff and its probably compatible with the N1/N5.
That would at least get you rolling. Hope it helps!