I bought the discs which Dave did for the 9000 a while ago and can recommend them .
They make you realise what can be achieved with the Yamaha boards if you take the time to search out and use all the possibilities.
Dave opened up a new era for me by willing me to use the board fully.
cheers
Eddie

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Eddie from Rotherham
Skype:eddiefromrotherham
www.yamahakeyboards.info