The 4.1 mix out of the 6 channel matrix arguments makes sense. I guess I didn't know exactly what channels the 6 channel matrixed mix were. Its not that I was wanting a 5.1 mix just to have 5.1, but something that has the 70mm track sound mix. Especially for ESB, where there are some major audio differences. I think the 70mm/35mm mix for SW was the same, and I don't remember what they did for ROTJ.