The lowest volume on my phone is still too loud for background study music. My phone (Moto G) has 'notched' volume control: the volume can only be raised by levels. I can set my volume to 0 or 1 but not 0.5 or some variant. The IPod touch that I previously owned had a sliding volume control. I was able to change the volume to somewhere in between levels. Is there an app for this?