via this auction
"The Standuino fraAngelico is an 8-bit PWM digital synth, built on the Arduino platform.
It does not use any D/A convertor, but the sound is generated by one digital output pin using Pulse Width Modulation. Resolution of this technique to achieve different voltage levels is 8-bit, but in the true essence the output from the synth is just 1-bit because the output pin does just 1 or 0 which makes distinctive digital character to its sound."
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