Hi Herbert,
as far as I understand, does the 9000pro start with version 1.0 wich is the same or higher as 2.1 from the psr-9000.
I red this on the german forum from 9000pro owners.
Hope this helps.
Eric
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Genos, PSR-S970, TC Helicon VoiceLive3, Mackie 802-VLZ3 Mixer, 2 Bose L1 Pro16, Electro-Voice ZXA1 Subwoofer