How to convert Dolby Surround to 4 separate wavs ?

[nuviz]

I have a new microphone for my camcorder: the Vive Surround Sound Microphone. The microphone encodes its four channels (Left, center, right and mono surround) to a matrixed stereo signal that can be decoded with a prologic receiver. I need to find a way (recipe ?) to convert the matrixed stereo wav to 4 mono wavs for editing.

Does anyone know how to do this ? Is there an application that does that ?

Thanks !