I'm sure it is possible, using the sound editing facilty in the KN7000, to produce a 'fall' sound on the Unison Saxes. The 'new' sound could then be stored in Sound Memory. I'm not near my KN7000 at present, but I'll have a look the Trombone Long Fall tomorrow and see how it is implemented. It could be that the particular sound is a direct sample of a real Trombone, executing the 'fall' in which case, it won't show up as a pitch change, when the sound is copied in to the editor.
Bear in mind that Saxes cannot execute the same kind of large continuous pitch slide possible on a Trombone.
Could be why that option is not present in the Unison Saxes
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Willum