- http://www.instructables.com/id/Powering-Arduino-with-a-Battery/
- http://interface.khm.de/index.php/lab/interfaces-advanced/arduino-realtime-audio-processing/
- http://playground.arduino.cc/Main/MIDILibrary
- http://www.instructables.com/id/Arduino-Audio-Input/
- http://www.instructables.com/id/Send-and-Receive-MIDI-with-Arduino/
- http://www.instructables.com/id/Arduino-Frequency-Detection/