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. More.

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