Dribbble - ui_volume.jpg by James Cipriano
no labels. few options. clear what is going on here and what you as a user are to do with it.
Light UI Knob by Lello Avallone
Royce volume knob | Ui Parade – User Interface Design Inspiration
Volume slider | Ui Parade – User Interface Design Inspiration
4-output Headphone Distribution Box with Independent Volume Control