Not sure about the PLG150AP board...my friend Johnny's 9000Pro doesn't have any boards installed. He uses his sometimes on stage, in a trio setting, and being the former on road piano player for Glen Campbell for several years, he's tickled having that extra bit of keyboard real estate.
He's playing it in stereo through a Stagepas 500...it really sounds great.
I thought I saw someone raving about the piano board on the Keyboard Corner forum. It's probably a good investment if they are still available.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.