PNG MORE
UI
Pixel
Windows 8 Pack (Metro Style)
Mute
DarkSlateGray
26x26
PNG ICO ICNS MORE
Boolean
Mute, speaker, sound
16x16
Fugue Icons
Mute, speaker, Control
DarkRed
Gnome icons
volume, Mute
Black
24x24
Silk
sound, Mute
Gray