Earphones gone crazy

Ok, so you'll be reading weirdest thing in your whole freaking day.
My phone:
I have S3 i9300, 5.1.1 Android
Purely rooted, Nothing has done to sounds system.

I have a problem with my earphones it won't let me enjoy my sleep or when I am on my way to school, it only plays the background music excluding the main vocals of the song and there is a tiny button on that earphone on which when pressed pure song extracts.

Any solution? I have tried almost everything to take this shit out but nothing gave pleasure.

Successful help will be appreciated