Hi Tony,
Here are a couple of new premium pan flute voices for the T4:
http://www.music-tyros.com/tyros4/features/premium/panflute.html
They are not the same as the Solitaire, but might work for you.
There are a couple of demo videos too.
Hope this helps.
Eric
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Genos, PSR-S970, TC Helicon VoiceLive3, Mackie 802-VLZ3 Mixer, 2 Bose L1 Pro16, Electro-Voice ZXA1 Subwoofer