PNG MORE
UI
Pixel
Bijou
volume
Black
10x10
5x10
PNG ICO ICNS MORE
Fugue Icons
speaker, volume, low
16x16
volume, speaker
Lynx Black
high, speaker, volume
medium, Audio, volume
volume, Audio, low
Audio, volume, muted
Gnome icons
Audio, low, volume
24x24
medium, volume, Audio
volume, Mute
Tango
volume, low, Audio
32x32
high, Audio, volume
muted, volume, Audio