Cant' switch adapt sound on, galaxy S6

[AC Question]

I can find the feature in the settings, I have headphones plugged in, but there is no on/off slider to let me into it. Nothing happens when I tap it.

 

[anon8380037]

NOT the best reply you would get : but when I had a Note 3 the adapt sound and equaliser settings were part of the built in Music player. I would have to switch screen displays to find 3 or 4 tabs along the bottom, iirc.