Audio won't fade out.

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1

Hello.

Here I have a script that makes the audio fade-in when starting the game.

(All scripts are in C#):
using UnityEngine;

[RequireComponent(typeof(AudioSource))]
public class EasyFadeIn : MonoBehaviour
{
    [SerializeField]
    private int m_FadeInTime = 10;
    private AudioSource m_AudioSource;


    private void Awake()
    {
        m_AudioSource = GetComponent<AudioSource>();
    }


    private void Update()
    {
        if (m_AudioSource.volume < 1)
        {
            m_AudioSource.volume = m_AudioSource.volume + (Time.deltaTime / (m_FadeInTime + 1));
        }
        else
        {
            Destroy(this);
        }
    }
}

I used the same script to make it fade-out by changing the ‘+’ to a ‘-’ and some other minor changes. It works great when I set the volume in the AudioSource to 0.
using UnityEngine;

[RequireComponent(typeof(AudioSource))]
public class EasyFadeOut : MonoBehaviour
{
    [SerializeField]
    private int m_FadeInTime = 10;
    private AudioSource m_AudioSource;


    private void Awake()
    {
        m_AudioSource = GetComponent<AudioSource>();
    }


    private void Update()
    {
        if (m_AudioSource.volume > 0)
        {
            m_AudioSource.volume = m_AudioSource.volume - (Time.deltaTime / (m_FadeInTime - 1));
        }
        else
        {
            Destroy(this);
        }
    }
}

Now, what i want is the audio fade-out script to start playing after Coroutine “waiter” has been started in the following script:
using System.Collections;
using System.Collections.Generic;
using UnityEngine.SceneManagement;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;

public class MenuControl : MonoBehaviour
{
    private EasyFadeOut EasyFadeOut;
    private EasyFadeIn EasyFadeIn;
    private int FadeInTime = 10;

    private Delete Delete;
    public AudioSource audioSource;
    public Image black;
    public RawImage black2;
    public Animator anim;
    public Animator anim2;
    public Animator anim3;

    public void ButtonStart()
    {
        StartCoroutine(Fading());
        Delete = GetComponent<Delete>();
        EasyFadeOut = GetComponent<EasyFadeOut>();
        EasyFadeIn = GetComponent<EasyFadeIn>();
    }

    public void ButtonQuit()
    {
        Application.Quit();
    }

    IEnumerator Fading()
    {
        anim.SetBool("Fade", true);
        yield return new WaitUntil(() => black.color.a == 1);

        GameObject[] gos = GameObject.FindGameObjectsWithTag("TestTag");
        anim2.SetBool("Fadein", true);
        foreach (GameObject go in gos)
            Destroy(go);

        anim3.SetBool("TextFadein", true);
        StartCoroutine(waiter());
    }

    IEnumerator waiter()
    {
        if (audioSource.volume > 0)
        {
            audioSource.volume = audioSource.volume - (Time.deltaTime / (FadeInTime - 1));
        }

        yield return new WaitForSeconds(10);
        anim2.SetBool("Fadeout", true);

        yield return new WaitUntil(() => black2.color.a == 1);

        if (audioSource.volume == 0)
        {
            SceneManager.LoadScene(1);
        }
    }
}

But sadly, it only works for a split second before it stops. It changes to volume from 1 to 0.998 (or something similiar) before it stops working.

How do I make it so it continues playing until the volume has reached 0?

I hope you understood my question, as English is not my native language, and I am still learning.

Thank you in advance.

2

Without going to deep into your code, I would straight up recommend you to use two AudioMixerSnapshot for the fading. You can basically set up Snapshots with specific settings for your Audio mixers. So in your case a Snapshot where the volume is 100% and another one where the volume is 0%

Once set up you can just transition from one snapshots to an other like so, like so:

mySnapShotMusicOn.TransitionTo(0.5f); // Use to fade your music in, withing 500 ms
mySnapShotMusicOff.TransitionTo(0.5f); // Use to fade your music out, withing 500 ms

Here is a video of someone giving you an insight how to use snapshots: Unity Audio Mixer Groups and Snapshots
Hope this helps, good luck!