I have no idea, John, but I know a man who will. He's not on the Sphere so I'll send a message by other means, "asking, for a friend" so to speak. I'll let you know what he says.
Meanwhile, I was experimenting with making the sounds you specified and came up with the adjective "sphinctral". Best not go there, though. Think of Athene and the Aulos and what happened when she caught sight of her flute-face. Marsyas...
I'll ask Nigel. It's for the best.
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