I'm almost afraid to say that I have no problems with my new 900. I have 2 weeks of jobs under my belt and all works perfectly. I haven't tried everything because I play arranger style only, but I do use all the variations, ots, registrations, mixing, etc.
This is scary news though.........
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Yamaha 920 / Yamaha DGX-670 / Maui 5 Go (2) / Senn e935 / Sony C80 / Tascam DP24sd / ATEM Mini Pro switcher (studio)