Well out of curiosity, I called Sonic today and chatted with a sony tech regarding the free mydvd update to 4.5 that comes free with the Sony Dru500a. My first question was when will it be available. Nobody new the answer. The tech from Sonic told me the 4.5 will be a specific release for the Sony Burner to take advantage of all its capabilities. I asked him if multiple audio streams was in the works but he did not have an answer. Well I figured I would share this with the mass. By the way I love using the Arcsoft to re-encode my videos and then burn it to DVD. All in one step. Works great and is fully automatic.