Sound and Music

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To do: There needs to be a brief description or link to a tutorial or guide on how to take an existing .wav file and make it accessible to the Hammer Sound Browser or Face Poser.

Sound in Source can be processed in many ways. It can emit from a location in the world, have its pitch or volume altered, trigger behaviours from NPCs, and be lip synced.

Music differs from other sounds in Source only in that its path is prefixed with a '#' character. #sound.wav (or .mp3) is music whereas sound.wav is not.



AI sounds

  • AI sounds are not audible to the player; they are purely an AI construction. They can be placed in-map with the ai_sound entity.



To specify the set of sounds for a custom material (the noises produced in response to hits, scrapes, etc), see Material surface properties.


  • To play music, use Hammer Sound Browser to search for keyword music.
  • Many entities can have sounds assigned to them. For example, prop_door_rotating can be assigned sounds for opening, closing, swinging, being locked, and being unlocked. See the individual entities for details.

See Also

External links