i put on the organ pro 9000 yamaha but the buttons do not works why all of tem. for rythym; voices etc Add new comment Comments 2019, September 3 - 06:12 #418393 SzBálint 16 years 8 months**** hello: https://elektrotanya.com/showresult?what=pro%209000%20yamaha&kategoria=&... Bálint 0
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