I can't tell what keyboard it is, but I can hear the chorus and decay problem.
It's a good sound though, just needs tweaking.
Have a listen to this one.
http://www.irishacts.com/mp3/grandpiano-2.mp3 I used the same Purgatory Creek midi file as you did. The Piano is my own work, I sampled it myself, and it's playing back on an OASYS in this demo.
That Purgatory Creek midi file burns my ears though no matter what I hear played back from it.
For example, here's the same sound played live by me.
http://www.irishacts.com/mp3/grandpiano-1.mp3 And here's the same sound in a full sequence.
http://www.irishacts.com/mp3/grandpiano-3.mp3 The last two demo's in my opinion give you a better idea how it sounds than the Purgatory Creek midi file.
lol... I'll have to start my own Piano Shoot out website.
Regards.
James.