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Also, ability to choose an audio output device (so it can clack on my dedicated USB speaker instead of my main HiFi speakers).

That makes sense, I will add it in a future update.

You could also consider adding a little demo to your readme to showcase the speed and available sounds. Good luck with your project!

Thank you for your suggestion; it could be very helpful. I'll consider creating a landing page to make it easier for users to understand.