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The videos do not work, what is a pity, I really would like to hear some results!

Would it be easier to just provide simple audio files?

Curiously the default has audio output off. That is, was the little speaker icon unmuted?

Some of the videos worked for me but I found the generated melodies rather samey.

They work, but are chrome only, GP is probably using firefox and didn't-think/couldn't-be-bothered to check the adware browser.