Hello,
You have to use your soundcard and any sound editor (Windows Sound Recorder, Cool Edit, SoundForge, Acid, Cubase, Cakewalk,...)
If your soundcard has SP/DIF input you can use it. Otherwise plug the L/R output to the line input of your soundcard.
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Regards,
Xavier
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Alchemist - the Korg Trinity to Triton PCG and SNG converter -
http://web.wanadoo.be/alchemist