Grouping with a Mixer

Learn sound groups and level control with an Audio Mixer.

Audio grouping with Audio Mixer

An Audio Mixer is a professional routing hub organizing hundreds of game sounds into manageable channels. Beneath a primary Master channel, sub-groups (AudioMixerGroup) like BGM and SFX are assembled.

// Routing AudioSource output to a mixer group
public AudioMixerGroup sfxGroup;
source.outputAudioMixerGroup = sfxGroup;

This allows altering all sound effect volumes simultaneously through a single channel slider.

Decibel (dB) unit and parameter control

Audio Mixer volume sliders operate on a logarithmic decibel (dB) scale: 0 dB represents unity gain, while -80 dB corresponds to total silence (mute). To adjust parameters via code, call SetFloat.

// Setting SFX volume to -10 decibels
audioMixer.SetFloat("SFXVolume", -10f);

Mixer buses also host DSP audio effects like Reverb or Lowpass filters directly along channel strips.

Exercise Print group and volume level

Assign "SFX" to group and "-10dB" to volume. Print Group: SFX | Volume: -10dB to the console.

Show example solution

using System;

class Program
{
    static void Main()
    {
        string group = "SFX";
        string volume = "-10dB";
        Console.WriteLine("Group: " + group + " | Volume: " + volume);
    }
}

Test yourself

Which tool enables players to adjust all sound effects simultaneously with a single slider in settings?
- MeshRenderer and Lightmap
- Audio Mixer and AudioMixerGroup
- Particle System Collision
- Rigidbody Constraints
Show answer

Audio Mixer and AudioMixerGroup — Audio Mixer bundles sounds into groups, providing collective volume control through single master parameters.

Assign mixer output group

audioSource.____ = targetGroup;

Show answer

audioSource.outputAudioMixerGroup = targetGroup;

Mixer concepts

Audio Mixer

Mixer asset governing audio channels
AudioMixerGroup

Sub-channel group for similar audio
Decibel (dB)

Logarithmic volume unit (0 to -80 dB)
SetFloat

Method updating mixer value via code

Next lesson: Summary - Audio

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