I would like to play some mp4, which are 5 channel surround on my Xbox 360. From what I have read, the Xbox 360 will play mp4's, but only 2 channel mp4's. Apparently on pc, there is a program called Yamb, but all I have is my Mac. Does anyone know of a simple way that I can convert these 5 channel mp4's to 2 channel? I do have the 2 channel tracks.... just not within the file itself.