2 cents worth on sound fonts
I'd like to add my 2 cents worth on this discussion about sound fonts. I only have experience with piano sound fonts and I have experimented with several dozen of them. I (reluctantly) came to the conclusion a few months ago that the only way to satisfaction was to create my own font. Here is an example using my latest sound font: http://ormusic.home.comcast.net/Balmoral.mp3
The font is large; it has four velocity layers and practically every note has individual samples. You need a fairly hefty computer to export a large tune out of Musescore in wav format. (The example takes about 4 minutes to export on an i7-2600 cpu.) I believe that a variety of fonts should be available to Musescore users: some will be satisfied with the default TimGM6mb font; others will demand as realistic a sound as can be obtained. It shouldn't be that one or the other of these extremes should be relegated.