Essential and frequently used volume control on smart phone is Volume sliders.
What if these volume sliders are directly available to you in notification bar ? Just swipe down and access volume in notification bar. isn't it quick and easy?

Control volume from notification bar without pressing physical volume keys.
This is the small little app (150 kb in size) without any nasty permissions or background services.

It provides maximum customisation options with clean simple UI. app allows notific