Assistive Volume Button

Assistive Volume Button is a music & audio app by mCreations with 5,000,000+ downloads (about 9M estimated). +50K installs in the last 7 days. Rated 4.2 from 19K ratings. Released Oct 31, 2018. Install growth, rank history, SDKs and ad networks.

From the store listing: “Simulate the phone's physical volume and power keys on the screen. Assistive Volume Button shows the volume and power buttons on the edge of the screen which simulates the volume control and screen on/off functionality of the phone's physical keys. App also provide the option to show the app's own volume slider or…”