Thanks for the suggestion not sure what menu item you're referring to. I am using the new Google Chromecast with Google TV, usually, and it works on my other chromecast with google tv located elsewhere in my house, i can short press the channel im watching which brings up a menu which in it has the channel options menu where normally I can adjust aspect ratio/zoom/audio track/audio shift and subtitles. There used to be, under audio track the option to choose between channel 1 audio and channel 2 audio. Today, I noticed this option simply has one channel of audio which labelled "und".