```bash
$ media [TAB] [TAB]
pause   play    skip    volume

$ media play [TAB] [TAB]
itunes spotify

$ media pause [TAB] [TAB]
itunes spotify

$ media skip [TAB] [TAB]
itunes spotify

$ media volume [RETURN]
output volume:20, input volume:100, alert volume:100, output muted:false

$ media volume [TAB] [TAB]
down up

$ media volume up 10 [RETURN]
output volume:30, input volume:100, alert volume:100, output muted:false

$ media volume down 10 [RETURN]
output volume:20, input volume:100, alert volume:100, output muted:false
```