If you want results rather than a learning experience, consider upgrading to a Teensy 3.2 and Teensy Audio Adapter. The Teensy (ARM Cortex M4) has the power an

If you want results rather than a learning experience, consider upgrading to a Teensy 3.2 and Teensy Audio Adapter. The Teensy (ARM Cortex M4) has the power and I/O to produce quality audio. It still uses the Arduino IDE and APIs, and the audio library gives you a high level toolkit. I have implemented several soft synths on the Teensy, both with and without the audio library. It works. https://www.pjrc.com/teensy/td_libs_Audio.html https://www.pjrc.com/teensy/td_libs_Audio.html