Sometimes all comes to the point where you need an external device to record any sound that comes out of your computer. It can be either a miniDisc recorder or a DAT recorder.

Plug it to your PC, and capture the sound that comes out of it while you play the songs.

Then you can resample the sound from the DAT/miniDisc to the PC (back) and you'll have WAVs of your tunes

WAV files are easily encodable into MP3

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By the way... about Rebirth... You CAN DIRECTLY export your song as a WAV file (then convert it with any mp3 program). It works, as long as you understand completely the SONG MODE.

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Maybe ACID can "mixdown" the tracks into one WAV file.. I am not sure..

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Cubase can mixdown all your audio tracks into one WAV file too, HOWEVER -> the MIDI tracks will be lost. It only works with the audio data tracks.

Hope these details will help you, good luck!
By the way... WELCOME TO ONLINEDJ.COM!