Stumped In Nn-xt, Key-triggered note-off? Options

[Levon River]

I was building a drum kit in Reason's NN-XT and ran into the old open hi-hat>closed hi-hat annoyance of finding no easy way to have the note-on of a closed hi-hat sample close the envelope of the open hi-hat sound.

Since I didn't have any crushing immediate need for that kit patch, and having other things to do, I didn't devote a lot of time to trying to make it work--until a few days ago when playing around with various sounds I loaded an EMU drumkit soundfont into the NN-XT, and that exact thing was working in *that* kit. So I went "hmmm" and determined that, yes, unlike, e.g., the K-2000+, this can be done in the NN-XT without a Bill being passed through Congress. So I started trying to isolate how it was being done in that EMU soundfont kit, and I completely came a cropper. I still haven't isolated how and why it's working, or how to then apply those NN-XT settings to the kit I'm building--the point being that if the NN-XT can read it from the soundfont and honor it, then it can have it programmed into a patch being built from the ground up.

I've dealt with this issue in other hardware and software samplers and know about some of the various approaches, but the Reason manual doesn't mention this anywhere that I can find, and I haven't cracked it yet. Anybody know?