I have the top Roku box with HDMI 1080P output. Just activated Vudu . My AV receiver does not do hdmi. l run the hdmi to my tv and then optical from tv to av rec. All devices and other movie channels on roku does 5.1 but vudu says audio not supported. If I go into my tv menuand set audio to stereo from 5.1 it will have stereo audio. Wonder if this is a vudu/roku issue or my issue. Any thoughts?