I've had a look at the Trombone Long Fall sound and it is, as I suspected, within the original sampled sound.
A similar effect could be achieved on any of the sustained sounds, such as Trumpet, Sax, Strings etc. by editing the Pitch Envelope, using the KN7000 editing facility. However, it would require quite a bit of time and experimentation and in the end, may not sound too good

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Willum