It doesn&#x27;t appear to be as monotonous as the tiny spectrogram suggests, it&#x27;s a sequence of subtly different tones: <a href="http:&#x2F;&#x2F;imgur.com&#x2F;Z7S9Chq" rel="nofollow">http:&#x2F;&#x2F;imgur.com&#x2F;Z7S9Chq</a>