Equaliser

It already has an equalizer. Granted you need headphones plugged in, to be able to manage it.
On a side note, the last audio setting update totally screwed my preset equalizer setting and now I can't get it back to the way it was. It just doesn't sound right with headphones anymore. smh
 
Settings->audio. Quite easy to find. And quite easy to find it yourself, using a SEARCH ENGINE

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The audio setting is total fail, it show the equaliser screen fir mili second and then it goes to previous setting of flip to silent