On a more serious note, I think that, like in my VA7, many of the sounds are just to ensure compatibility with the styles from older keyboards, like the G1000, the G800, etc.
Best regards
Andy
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.