Sound Issues on Google Chromecast with Google TV

[Bigdave069]

I have Better Xcloud on my Google Chromecast with Google TV. The video and controller input works fine but there is no sound for streamed games. I can select my game and the Xbox logo will make a sound but nothing within the game. I've tried it with Banjo Kazooie, Monopoly and COD.

The TV aspects of the Chromecast work fine so it isn't a general sound issue.

Is there any settings which will overcome this issue? Or is it a built in bug?