Hi @Bryan, welcome to the family
So what you want is the when you release the key that you hear the release sound of the original
Hardware, right?
In Kontakt you have to define groups and assign different sections of the sample so that when you release the key a different sample or section of the sample is played.
Here in Kontakt the yellow section is triggers when the key is released.
I cannot speak about Decent Sampler if that option is possible,
Found a documentation where there is something written about release triggers
https://www.decentsamples.com/docs/format-documentation.html