add source
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// originally by Joby Taffey
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// http://chiphacker.com/questions/2057/polyphonic-sounds-from-a-microcontroller
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#include <avr/io.h>
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/interrupt.h>
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#include <avr/delay.h>
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#include <avr/delay.h>
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