PNG ICO ICNS MORE
UI
Pixel
Boolean
volume
DarkSlateGray
16x16
Fugue Icons
speaker, volume, none
Photography & graphic design
3D
Dark Glass
Mixer, volume, player
128x128
Network & communications
Smooth
Oxygen
player, volume
48x48
Desktop apps
KDE Crystal Diamond
volume, player
22x22
Mixed
Vista Inspirate
Crystal Clear