Turn your Arduino into a 4 voice wavetable synth with only a few components... - http://www.instructables.com/id/Turn-your-Arduino-into-a-4-vo...
Multiple synthesizer projects have been done for the Arduino, but few have been able to utilize the full power of the Arduino processor. DZL from GeekPhysical wrote a 4 voice wavetable synthesizer that is one of the more advanced software based synths for the Arduino.  It has wavetables included (sine, saw, square and triangle) and envelopes to create beats. ‎- Скажи это моей лошади