Maybe with a lengthy pre-set rhythm pattern, like a long spool of irregularly notched metal that determined the timing of the vibrate-y bits? You could make the repeating pattern long enough that a sandworm wouldn't twig to it.
Although really, thinking too hard about the technology in Herbert books just makes my head hurt. It takes a lot of handwaving to make his premises make sense. I prefer to experience them as like a music video of interesting ideas that don't have to make sense.
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Although really, thinking too hard about the technology in Herbert books just makes my head hurt. It takes a lot of handwaving to make his premises make sense. I prefer to experience them as like a music video of interesting ideas that don't have to make sense.