Pop Toob (or Rapper Snapper) toys make sounds that readily show the relationship between the lengths of the Toobs and the frequencies of the noises that they make when they change shape. I used SpectrumView to acquire a waterfall spectrum of a Toob as it is stretched to full length and then squeezed back to its minimum length. Reading the waterfall spectrum from the bottom upward, note the frequency maxima shift to lower frequency as the Toob is stretched, and then the maxima shift back toward higher frequency as the Toob is re-compressed.
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