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Mixed
Outline
Free Daily Icon Set
sound, on, voice
Black
512x512
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Essential Line icons
volume, Audio, media
345x512
Flat
Pictograms vol.1
switch, music, volume
SlateGray
sound, communicate, phone
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Mixed rounded flat icon
megaphone, sound, notification
Tomato
Filled outline
Line color mix Vol.1
play, volume, music
Line color mix Vol.2
play, Headphones, music
Mayssam
Full, volume, sound
sound, film, movie
player, media, video
off, media, volume
Glyph
Simple files
speech, sound, Microphone
Free Misc Icon Set 2
off, sound, speaker
on, sound, Audio
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Things
sound, Audio, volume
SteelBlue
Orbicons (Free)
music, Headphones, listen
LightSeaGreen
mp3, ipod, sound
SkyBlue
bitsies!
music, Multimedia, pop
Silver
music, piano, instrument
DimGray
off, no sound, Mute
Amenities - Outline
sound, Club, Dance
Amenities - Solid
Dance, speaker, sound
Locations - Outline
Audio, music, sound
Club, sound, speaker