Unity Audio is a bit cryptic, and changing volumes often results in artifacts (pops). The following function attached to an SR_Sound script on my SoundController game object fixes it. You can use the same technique with audio sources too, but those are a bit less cryptic. I will include that as well.
AudioMixer SoundMixer = SoundController.GetComponent<SR_Sound>().Mixer;
StartCoroutine(SR_Sound.MixerSetVolume(SoundMixer, "Thrusters", 30f));
//to avoid annoying clicks in audio mixer volume changes
public static IEnumerator MixerSetVolume(AudioMixer _Mixer, string _WhichExposedParam, float _Vol = 0.001f, float _FadeLength = 0.1f)
{
//Debug.Log("Fading out soundfile" + _AudioSource.name);
if(_Vol == 0f) { _Vol = 0.001f; }
float _StartVolume;
bool __IsMixerParamExposed = _Mixer.GetFloat(_WhichExposedParam, out _StartVolume);
Extensions.Log(_WhichExposedParam + " mixer = " + _StartVolume);
float _EndVolume = _Vol;
float _StartTime = Time.time;
if (_StartVolume > _EndVolume)
{
while (Time.time < _StartTime + _FadeLength)
{
_Mixer.SetFloat(_WhichExposedParam, _StartVolume - ((_StartVolume - _EndVolume) * ((Time.time - _StartTime) / _FadeLength)));
yield return null;
}
}
else
{
while (Time.time < _StartTime + _FadeLength)
{
_Mixer.SetFloat(_WhichExposedParam, _StartVolume + ((_EndVolume - _StartVolume) * ((Time.time - _StartTime) / _FadeLength)));
yield return null;
}
}
}
To tame Audio Sources:
public static IEnumerator VolumeFadeOut(AudioSource _AudioSource, float _FadeLength = 0.1f)
{
//Debug.Log("Fading out soundfile" + _AudioSource.name);
if (MasterVolume == 0f) { yield break; }
float _StartVolume = _AudioSource.volume;
float _EndVolume = 0f;
float _StartTime = Time.time;
while (Time.time < _StartTime + _FadeLength)
{
_AudioSource.volume = _StartVolume + ((_EndVolume - _StartVolume) * ((Time.time - _StartTime) / _FadeLength));
yield return null;
}
if (_EndVolume == 0) { _AudioSource.Stop(); }
}
public static IEnumerator VolumeFadeIn(AudioSource _AudioSource, float _EndVolume, float _FadeLength = 0.1f)
{
//Debug.Log("Fading in soundfile"+_AudioSource.name);
if (MasterVolume == 0f) { yield break; }
_AudioSource.volume = 0f;
_AudioSource.Play();
float _StartVolume = 0f;
float _StartTime = Time.time;
while (Time.time < _StartTime + _FadeLength)
{
_AudioSource.volume = _StartVolume + ((_EndVolume - _StartVolume) * ((Time.time - _StartTime) / _FadeLength));
yield return null;
}
}
