Depends how you look at it.
Although the Tyros 2 is the top of the range, there is no mention of PSR in the details or literature, so as far as the PSR details are concerned the S900 is the top of the PSR range.

Bill
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English Riviera:
Live entertainment, Real Ale, Great Scenery, Great Beaches, why would anyone want to live anywhere else (I�m definitely staying put).