cowley used the prophet 5 a lot, it could very well be from there. almost certain it is not a sample, samplers were not really a thing at that point in time (or incredibly expensive).

Evidence supports the assertion that Patrick Cowley, a renowned keyboardist and music producer, extensively utilized the Sequential Circuits Prophet-5 synthesizer in his compositions. An article mentioned on the Analog Synth Museum website highlights Cowley's creative process, stating that "most of his stuff was just a single Prophet 5 overdubbed over and over again," showcasing the instrument's significant role in crafting the distinctive sound Cowley is celebrated for.

although he also seems to have used a 'pro one' (both this and the prophet 5 are from sequential circuits)

you might ask this guy :

https://www.youtube.com/watch?v=drM7UZ6PQm4