I think the 128 styles was a typographical error. I think the number 128 was meant to be for the polyphony. The SD5 and SD3 have 128 note polyphony and both have exactly the same numbers of styles.

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George Kaye
Kaye's Music Scene
Reseda, California
818-881-5566
www.kayesmusicscene.com
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George Kaye
Kaye's Music Scene (Closed after 51 years)
West Hills, California
(Retired 2021)