Originally Posted By Gunnar Jonny

The exact number most likely depends of what model it's compared to.

At PSR Tut there is stylelists and info for different Yamaha models:
https://www.psrtutorial.com/sty/yamaha/index.html


In addition Yamaha keeps changing names of the same styles.
There will be probably far less than what it looks like.
Compared to the S975 a lot more styles
Compared to the Genos only a handful.
They are available for download on the PSR Tutorial site.
I did audition most of them ....
Eric
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Genos, PSR-S970, TC Helicon VoiceLive3, Mackie 802-VLZ3 Mixer, 2 Bose L1 Pro16, Electro-Voice ZXA1 Subwoofer