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WOW, Beautiful & Inspirational. I want one too, I already have the stepper motors and arduino
I've also done much research on this, it seems the Digital to Analog Converter on the Pi that is used to create the sound is not that great, seems like high sound fidelity was not a big concern when creating the Pi. You will have to either live with it or get something like HiFiBerry, which is a High Fidelity Audio Hat for the Pi with RCA output.
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