The echo (if there is any) wasn’t being played in most of my friend’s clients. I have still yet to hear any Karaoke-related audio effects, so I’m not sure if there is any. All I heard is from some stranger that there’s actually echo feature.
Voice chat, despite some of us being able to hear just fine, was not being sent to a number of us. Some of us could hear it while others didn’t even receive the voice indicator. They were able to hear others just fine.
The echo feature was planned, but the devs couldn’t figure out how to make it work so it was never added.