sound_mix_layer

 sound_mix_layer is a point entity available in Left 4 Dead 2. It is an entity used to set a mix layer to a specific value.

 Note: Developers seeking how to manage priorities of specific sounds should refer to mixgroups found in pak01_dir.vpk: /scripts/soundmixers.txt

Keyvalues

Mix Layer Name <string>

Name of the mix layer to be setting the level of.

Level <float>

Set the Mix Layer Level

Targetname:

Name (targetname) <string>

The targetname that other entities refer to this entity by.

Inputs

Level <float>

Set the Mix Layer Level

Targetname:

Kill

Removes this entity from the world.

KillHierarchy

Removes this entity and its children from the world.

 Note: Entities already remove orphaned children upon being removed, but this input removes all children on the same frame, being marginally faster than Kill.

AddOutput <string>

Adds a keyvalue/output to this entity. It can be potentially very dangerous, use with care.
KV Format: <key> <value>
I/O Format: <output name> <targetname>:<inputname>:<parameter>:<delay>:<max times to fire, -1 means infinite>

FireUser1 to FireUser4

Fire the OnUser outputs; see User Inputs and Outputs.

Use  !FGD

Same as a player invoking +use; may not do anything depending on the entity. Can also be invoked by firing an output that does not specify an input.

RunScriptFile <script> (in all games since )

Execute a VScript file from disk, without file extension. The script contents are merged with the script scope of the receiving entity.

RunScriptCode <string> (in all games since )

Execute a string of VScript source code in the scope of the entity receiving the input. String quotation may be needed when fired via console.

 Bug: In , the code is executed in the script scope of the entity that fires the output, not the one receiving the input.

 Warning: Never try to pass string parameters to a script function with this input. It will corrupt the VMF structure because of the nested quotation marks, which then must be removed manually with a text editor.

CallScriptFunction <string> (in all games since ) !FGD

Execute a VScript function in the scope of the receiving entity.

SetLocalOrigin <coordinates> (in all games since ) !FGD

Send this entity to a spot in the map. If the entity is parented to something, it will be offset from the parent by this amount.

SetLocalAngles <angles> (in all games since ) !FGD

Set this entity's angles.

Outputs

Targetname:

OnUser1 to OnUser4

These outputs each fire in response to the firing of the like-numbered FireUser1 to FireUser4 Input; see User Inputs and Outputs.

OnKilled  (only in )

This output fires when the entity is killed and removed from the game.

Mix layers

More information regarding MixLayers can be found in pak01_dir.vpk: /scripts/soundmixers.txt

These are listed in the dev console commmand snd_list_mixers

• mobBeatingLayer
• mobRulesLayer
• zombatMusicLayer
• zombatMusic2Layer
• zombatMusic3Layer
• witchRageLayer
• safeRoomLayer
• unaliveLayer
• PZVOWarnLayer
• chargerAttackLayer
• commentaryLayer
• undeathLayer
• adrenalineLayer
• fluMusicLayer
• rainLayer
• stormLayer
• voipLayer

Entries listed under the dev console command snd_list_mix_groups may work with a "Layer" post-fix, but need further testing.

External links

Audio Mixing (recorded music) - Wikipedia article regarding technical aspects of audio mixing