The only problem with the S-900 was the display--they had a large number of them that prematurely died. The number was so vast that in many cases Yamaha replaced them at no charge, even after the machine was out of warranty. The S-910 has a totally different display and the problem has gone away.

Gary cool
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)