I have an out of tune problem with the PA800 if the joystick is hit incorrectly. It remains out of tune until I fool with it again. But I think it only affects the RH sound being used.
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Yamaha 920 / Yamaha DGX-670 / Maui 5 Go (2) / Senn e935 / Sony C80 / Tascam DP24sd / ATEM Mini Pro switcher (studio)