IEnumerator SwapChannel(int channel)
    {
        if (channel < channels.Length)
        {
            StartCoroutine(AudioFader.FadeClip(aSource, fadeTime, false));
            yield return(new WaitForSeconds(fadeTime));

            aSource.clip          = channels[channel];
            radioChannelText.text = "Radio: 0" + (channel + 1);
            StartCoroutine(AudioFader.FadeClip(aSource, fadeTime, true));
        }
        else
        {
            StartCoroutine(AudioFader.FadeClip(aSource, fadeTime, false));
            radioChannelText.text = "Radio: Off";
        }
    }