Hi Gary

I'm thinking you may have ended up in the wrong place.
http://www.thejazzpage.de/index1.html

Scroll down the right side of the page titled Sitemap.

Towards the bottom you will see Downloads>Soundfonts.

On the Soundfont page right near the top after a write-up on the Gibson L5 guitar you will see midi and mp3 downloads of 3 songs, Stella By Starlight, Sweet Georgia Brown and Sushi. Check out Sweet Georgia Brown mp3.

Otherwise, I have no clue how to post the mp3.

I will be absolutely astonished if you can even come close to the sound of the soundfont on the Jazz Guitar as well as if you could tweak the piano on your keyboard to sound identical thoughout the entire range of the piano as heard on truepianos.com, otherwise I think Yamaha would have had this piano sound availabe on their keyboard and the only arranger keyboard that anyone would purchase would be the Yamaha The video at the bottom of this page is very interesting along with the mp3s.
http://www.truepianos.com/demos.php

It would be interesting to hear your or anyone elses tweaked sound posted using the midi of Sweet Georgia Brown. I can't believe it's possible to make it sound identical unless one is using similar technology.

Otherwise, this could interesting

Scott