I have today tweaked the FluidR3 piano to provide a mellower version for those who are finding the one designed by Frank Wen is too bright.
It is now in beta and is available from the public area of my Google Drive......
https://drive.google.com/open?id=0B7cZM0RQwkwSZFBiRjh6SlhJSFU&authuser=0
The intention is to eventually merge this with the main MuseScore2 default soundfont.
While it is still in beta it will remain a separate entity.
Please let me know of any issues that may need addressing here.