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The sound is incredibly soft, is it a reinforced PVC didgeridoo with « strings »?
Yeah, a sheet of flexible transparent PVC sold by the metre in some DIY shops, then it’s rolled into a cone so you get a perfect cone-shaped air column… covered with rope to dampen the plastic sound and it works pretty well, and on top of that on some models I covered it with polyester resin to add thickness, the results were really interesting too
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Effective indeed, in any case the sound seems really softened it’s pleasant 
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