Here is a guy who plays the PSR-S770 wink
https://www.youtube.com/channel/UCtKv05G0HgyJrIRhu-Q4Lbw
I ordered one for smaller gigs where I don't need all the bells and whistles of my Tyros 4
Impressive little board.
Eric
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Genos, PSR-S970, TC Helicon VoiceLive3, Mackie 802-VLZ3 Mixer, 2 Bose L1 Pro16, Electro-Voice ZXA1 Subwoofer