Samsung Galaxy S6 Edge: How to Enable Mono Audio Feature in Android 5.1.1 Lollipop

If you have certain hearing difficulty so you can only hear with one of your ears, or feel more convenient when using one earphone, you can make hearing with single earphone better by switching audio output in your Samsung Galaxy S6 Edge from stereo to mono by using mono audio feature. When this feature is enabled, your phone will combine stereo sound into one signal so you can hear the sound