I'm not sure but I think that maybe when you want to convert a .mid using your internal multimedia card's patches. I think I read that Sound Blaster let's you do this. Of course, you would be stuck with the quality of your soundcard. You say you are using a synth. You need to get the audio outs of your synths into your PC in order to make .wavs or .mp3s. Connect the audio outs of your synth into your soundcard's ins (make sure the volume is off and start low before making louder). Of course, if you have a mixer you would connect your mixer main OUTS to your soundcard ins. Once this is done just open up your .mid file and add a left audio and a right audio track. Hit record and it will record all of your midi tracks to those 2 audio tracks. You can then save the stereo track as a .wav or if your version of Cakewalk let's you...a .mp3. You can go to goolge.com and do a search for MIDI to .WAV converters. There is alot of freeware and shareware programs.