I asked AJ today how much more polyphony has been added to the SD1 with 4.0 and his answer was up to 15 additional voices for the voice section. I'm not sure what up to 15 means but it sounds good!
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)