Your post sounds more like an Idea or a Feature Request. The best place for this is in our Ideas Lab. This way someone from WD will be sure to see it. However, I would search first and make sure that there isn’t another idea similar to yours that you could add your post to and vote on.
Sorry. I evidently mis-read/misunderstood your post. I thought you were saying… actually I’m not sure now what you were saying. However, you should be getting sound out of your HDMI if you have the sound set to Stereo. If you have the sound set to Digital, the sound will go through the TOS/link.