cute or annoying?
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The sound is a little annoying, and good luck getting any kind of predictable pitch out of them. (I doubt markings would help. The people in the video above have markings, and look like they practiced a bunch, and they still sound pretty off.)

You can give up on that and just enjoy making beeps and farts and whooooeeeooo sounds and stuff.

They're also hiilarious and cute.