I can but I don't know if its correct, as I don't know what its supposed to sound like through a real quad setup. I did try but gave up to move onto other projects. I could try again sometime.
Its a different sound when you decode the 4 channels then blend them back into a 2 channel audio file. A couple of my audio programs will play 4 channels at the same time through my stereo setup.
Can't put it into words, you'd have to hear it. I'm not sure I have the files anymore but could process it again. Give me a week or so and I'll work on it.