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LCK captures game audio and microphone input during recording and streaming. It supports Unity’s built-in audio system, FMOD, and Wwise out of the box.

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How audio capture works

When recording, LCK captures all audio heard by the active AudioListener in the scene. Since the AudioListener is typically attached to the player’s HMD camera, recordings capture audio from the player’s perspective. The LckAudioMixer finds the game audio source using this logic:
  1. Look for an AudioListener in the scene. If found, check for a component implementing ILckAudioSource and use it if available. Otherwise, add an LckAudioCapture to that GameObject.
  2. If no AudioListener exists, look for an LckAudioMarker and follow the same logic.

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Audio settings

For best recording quality, set the DSP buffer size to Default or 1024 in your Unity Audio settings. Smaller buffer sizes can cause audio artifacts that are more noticeable in recordings than during live gameplay.

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Third-party audio support

LCK includes built-in support for FMOD and Wwise. Enable them by adding scripting define symbols in Edit > Project Settings > Player > Scripting Define Symbols:
EngineDefine Symbol
FMOD 2.02LCK_FMOD
FMOD 2.03+LCK_FMOD_2_03
WwiseLCK_WWISE
After adding the define, place an LckAudioMarker component on the GameObject where LCK should attach capture components.

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Special configurations

ScenarioDefine Symbol
Not using Unity Audio at allLCK_NOT_UNITY_AUDIO
FMOD combined with Unity Audio (e.g. Photon Voice)LCK_FMOD_WITH_UNITY_AUDIO + LCK_FMOD

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Custom audio sources

As of v1.2.0, you can implement ILckAudioSource to supply custom game audio to LCK: 
public class MyCustomAudio : MonoBehaviour, ILckAudioSource
{
    // LCK expects stereo, interleaved floats, at 48kHz
}
Place your implementation next to a Unity AudioListener or an LckAudioMarker. LCK will still collect microphone audio separately.

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Microphone control

[InjectLck] private ILckService _lckService;

_lckService.SetMicrophoneCaptureActive(true);   // enable/disable mic
_lckService.SetMicrophoneGain(1.0f);            // adjust mic gain
_lckService.GetMicrophoneOutputLevel();          // current mic level

_lckService.SetGameAudioCaptureActive(true);     // enable/disable game audio
_lckService.SetGameAudioGain(1.0f);              // adjust game audio gain
_lckService.GetGameOutputLevel();                 // current game audio level
Microphone permission timing is configurable in Edit > Project Settings > LCK (options: Startup, TabletSpawn, Mic Unmute, or Never).

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Discreet audio API

For audio that should be audible to the player but excluded from recordings (UI sounds, recording state cues), use the Discreet Audio API: 
// Play a clip once (excluded from recording)
_lckService.PlayDiscreetAudioClip(myAudioClip);

// Preload for longer audio
_lckService.PreloadDiscreetAudio(myAudioClip);

// Stop all discreet audio
_lckService.StopAllDiscreetAudio();
The LCK tablet uses discreet audio for its own recording start/stop cues by default.