AudioMixer.SetFloat

Parameters

Returns

bool Returns false if the exposed parameter was not found or snapshots are currently being edited.

Description

Sets the value of the exposed parameter specified. When a parameter is exposed, it is not controlled by mixer snapshots. You can only change the parameter with this function.

Note: Don’t call AudioMixer.SetFloat in the following event functions as it can result in unexpected behavior:

• MonoBehaviour.Awake
• OnEnable
• RuntimeInitializeLoadType.AfterSceneLoad

Instead, call AudioMixer.SetFloat in MonoBehaviour.Start or any event function Unity calls afterwards in the order of event function execution.

To see your exposed parameters,

1. Double click on your audio mixer. This opens the Audio Mixer window.
2. At the top right of the Audio Mixer tab, click on the Exposed Parameters button to show the list of exposed parameters.

To rename or remove a parameter, right click the item in the list.

If the parameter you want to expose isn't in the list, you need to expose the parameter. To expose a parameter, right click the parameter you want to expose in the Audio Mixer Inspector window, and choose Expose [parameter name] to script.

using System;
using UnityEngine;
using UnityEngine.Audio;

public class MixerVolumeController : MonoBehaviour
{
    // The range of the volume slider on a mixer group
    const float minVolume = -80f;
    const float maxVolume = 20f;

    public AudioMixer mixer;

    [Range(minVolume, maxVolume)]
    public float volume;

    float previousVolume;

    void Update()
    {

        // Sets the exposed parameter "volume" in the audio mixer,
        // In this example the parameter is assumed to be the volume of a mixer group.
        // It could be any other exposable mixer parameter.
        if (!Mathf.Approximately(volume, previousVolume))
        {
            mixer.SetFloat("volume", volume);
        }

        previousVolume = volume;
    }

    void OnGUI()
    {
        GUILayout.BeginHorizontal();
        GUILayout.Label("Mixer volume");
        var newVolume = GUILayout.HorizontalSlider(volume, minVolume, maxVolume, GUILayout.Width(300));

        if (!Mathf.Approximately(newVolume, previousVolume))
        {
            volume = newVolume;
            mixer.SetFloat("volume", volume);
        }

        GUILayout.EndHorizontal();
    }
}