One thing I did learn is that the soundfont file you choose all gets loaded into RAM, so choosing a really large soundfont consumes a lot of RAM, which can be a problem on older systems with limited RAM, especially 8 GB systems. There are a number of free soundfonts listed at the bottom of the web page. I've settled on the Arachno soundfont for it's balance of sound quality vs. size, but you can try others to see which works best for your type of music.