TiMidity plays MIDI and Module (.MOD) files. It does it in software without depending on any hardware MIDI support your soundcard might have.
Sound quaility can be much higher because it limited by your CPU's power and memory rather then your soundcard's power and memory.
TiMidity usally comes as a stand alone player. TiMidity MCD is a special version that installs at part of OS/2 Multimedia system so that most applications that played MIDI files through your soundcard before, now can
play MIDIs through TiMidity at a higher quality. This includes the Multimedia Workplace Shell objects and the Plug-in pack for Netscape.
Improvements:
Sound quality should be better then before. You can now play MOD files as well as MIDI files and you have the option of using SoundFonts as well as GUS patches. TiMidity no longer generates the C:TIM.LOG file by default.
Link:
http://www.reamined.on.ca/doconnor/timidity.html
Darwin O'Connor
Source: OS2VOICE