This might be hard to implement but I've never seen such thing in any other platform, and if twitch implements this technology I think its a big leap for all streaming platform.

Issue: There are three different sounds when it comes to streaming.

1- streamer voice (speech)
2- game sound
3- the music he plays if he decides to do so.

Imagine being on a stream where you enjoy what the streamer has to say, and you also want to keep hearing him because he's funny, and you also like the gaming sound, but in the same time he has some type of music which annoys the **** out of you, you ask him to bring the music down or close the music and he or chat goes (Just mute the stream).

The problem here is that I want to hear the streamer or what he does say but his music is not my cup of tea, whats the solution? Nothing.

I have myself been on streams where their music give me literal headache, because you see music tastes are different, and there are some in chat who loves their music its true. But imagine you have the ability to mute whichever you want on stream without having to mute everything.

You can,
1- Speech (mute)
2- Game sound (mute)
3- Music (mute)

If you want to mute all, then you can also do this, but now you have the option to mute one or two of the things you dislike, while keeping other sound outputs on, I don't even think youtube did this tech yet, and its huge I believe.

Imagine someone who enjoys the chill music on stream which is the opposite of the previous example, then he could literally mute the streamer speech, and game sounds but keep the music only.

Or you could mute the game sound & music but keep listening to the streamer talk.

I think this tech is big, and can open up much other things for the future.

Thanks for reading and sorry for my English, it's not my native language.

Yours,
Nawaf.