KMidi plays midi files using instrument patches. It does in software what a
soundcard like the GUS (Gravis UltraSound) or Sound Blaster AWE does in
hardware. So, the only hardware you need is a simple soundcard or chip. Even
if you have a GUS or AWE, you might still like to try KMidi, since it sounds
pretty good.

-rwxr-xr-x    1 root    root             1451 oct  1 10:04 /usr/lib/kde3/libkmidpart.la
-rwxr-xr-x    1 root    root             3804 oct  1 10:13 /usr/lib/kde3/libkmidpart.so