public void Update()
    {
        int index = 0;
        while (index < _activeSoundEffectInstances.Count)
        {
            SoundEffectInstance instance = _activeSoundEffectInstances[index];

            if (instance.State == SoundState.Stopped && !instance.IsDisposed)
            {
                instance.Dispose();
                _activeSoundEffectInstances.RemoveAt(index);
            }
            index++;
        }
    }