Fran,
I think you are wrong about the scat voices not being in any of the SRX expansion boards available. The complete orchestra contains orchestra 1, orchestra 2, vocal colections (which contains the scat voices), and one other I can't remember right now. The voice card has choir and the jazz scat voices included.
George Kaye
Kaye's Music Scene
Reseda, California
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George Kaye
Kaye's Music Scene (Closed after 51 years)
West Hills, California
(Retired 2021)