If you are looking for a simple audio control for your phone/tablet, let me save you the hours that I have wasted trying to find the right one....THIS IS IT!  It seemed like every wanted to boost the volume or i had to set up "sound profiles"  .....NO, I just wanted a simple bar that I can control by sliding it up or down, but with this app you can either have the sliding bar or volume buttons, but it took maybe 5 minutes to get installed and functional.  I recommend this app for a simple UI for those of us just want to control the volume of our device, not blast out the neighbors by enhancing the volume 600 percent after creating a sound profile and attaching it seperatly to every individual app!