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AVR Audio Synthesizer: Freq Done, Volume Done, ADSR Sucks
STK500/ATMega164P/R2R DAC based audio synthesizer. The scope is a Tektronix 2230 Analog/DSO. Tone generation is done using a 1024×8 sample table, DDS phase accumulator and fixed point math. Volume is done with a log gain lookup table adjusted for fixed point multiplication. ADSR sucks at the moment and only functions as very crappy distortion.
Posted by rmrubin 
December 2007