```
christos@tpad$ mixer vol.mute=toggle
vol.mute: on -> off
pcm0:mixer: <Realtek ALC257 (Analog 2.0+HP/2.0)> on hdaa0 (play/rec) (default)
vol = 0.85:0.85 pbk
pcm = 1.00:1.00 pbk
speaker = 1.00:1.00 pbk
rec = 0.37:0.37 pbk
ogain = 1.00:1.00 pbk
monitor = 0.67:0.67 rec src
```