Same problem here. It doesn't matter if it is through a device hooked up to HDMI or the built-in apps on the TV itself, The Voice sync problem is very frustrating. We just exchanged our Samsung 7300 for this Roku TV, and are greatly disappointed. On the Samsung, we had our Roku stick plugged in the back and had some problems with it. Even worse with an actual Roku TV and being hamstrung because of a lack of options to adjust the voice sync should not be acceptable on such an expensive TV.