MIDI is not the same thing as audio.
MIDI is just a computer communications language which containts set of instructions that tells equipment what notes to play, etc... It does not contain any audio information like a WAV file would. MIDI only triggers the sound generator in your PC or synth. Its like how those old player piano's used to work with the punch card roll.
MIDI is very usefull for recording music because it is not final like recording audio. You can go back and edit/change what you have recorded since it is just a list of events.
If you are at all familiar with different graphics formats, it would be the same as comparing vector graphics to bitmaps.
In order to hear your synth, you still need to connect its audio outputs to speakers of some kind
[This message has been edited by brzilian76 (edited 04-06-2002).]