jamrod
3
There isn’t a way to get the OT polyphonic in the way you’re looking for. The release is always going to be cut off.
The only (annoying) workaround I can think of is to make two separate patterns, identical except for having the sample in question on two different tracks. Then if you switch between them, you’ll be able to let the release play out. But that’s most likely not a practical solution.
You might also be able to fake something like a release with reverb or delay sends parameter locked toward the end of the sample.