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So called because of the curious way it works. Here at Flying Pig we haven't a clue what makes is change pitch - we just know it does, one of natures delightful curios! If anyone out there knows please let us know!
Anyway, down to business. Download the .pdf file and print it out onto heavy card (around 280 microns) Carefully score and cut out the bits and follow the picture instructions in the PDF file.