There is a Premium Pan Flute Voice that was introduced for Tyros 3 that you can also buy for the Tyros 4.
joesax
That may be the one Lee is referring to, Joe. I don't have it, so, unfortunately, I can't comment to him on how "squeaky" it is, or if there are any odd responses to note play.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.