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This is an interesting device, and worth the money I paid for it, but it's just a curiosity...something that would make an interesting and inexpensive gift. Not something that produces good sound, but I'm sure that wasn't the intention. I used it a few times, and that was it.
As a curiosity, did you try using different mediums for the speaker? We found a 1 foot cubic cardboard box (or shoebox) produces an impressive amount of sound.
Agreed it's not great audio quality, but certainly a very neat/novel product. Also it's a great lesson for kids (or adults) on how vibrations work to create sound.