hiho,
imo, the best way to license your sample is the
http://de.creativecommons.org/ Creative Common license.
and if you publish your samples or sond libraries (h2 drumkit) under this license we have no problems to distribute them from the h2 project page (sorce forge server).
IMO, it's must be save to record your instruments.
why? if i record my fender guitar, fender have absolute no rights on this recordings or samples. so it's must be save to record samples from your old korg trinity.
at least its a intrument like a guitar a piano or what ever.
greetings wolke