Why does TiMidity sound strange on the fast part of some passages?
This is probably a problem with the soundfont and not TiMidity. Fast, repeated notes, especially of the same pitch are the most difficult thing to emulate properly with a soundfont. Some pieces really demonstrate the problem, but there is not much that can be done. If you create a soundfont that works well for music with fast repeated notes, it will not sound good for most other types of music, so you pick the better of 2 evils and live with it.
