Adjusting Sound Output from "Music," "News," "Movies," etc.

Something used to pop up giving the options of sound output from "news," "music," "movies," etc. I wanted to set it to music, but can't find it now. I called the tech dept. and the gal I spoke to didn't know. We found an option in "Settings," titled "Sound Effects and Music," which can be turned off or on. It's not what I was looking for. I've actually changed this setting dozens of times, but can't find it now. Here's hoping...