MoveCar.PlaySound C# (CSharp) Method

    private void PlaySound()
    {
        if (isAccelerating == 1) {
            //slowly turn on engine sound
            audioSource.volume = Mathf.Lerp(audioSource.volume, 1, 0.1f);
        }
        else {
            //slowly turn off engine sound
            audioSource.volume = Mathf.Lerp(audioSource.volume, 0, 0.1f);
        }

        if (!audioSource.isPlaying) {
            audioSource.Play ();
        }
    }