I used this tuner to test it: http://www.audionotch.com/app/tune/ http://www.audionotch.com/app/tune/ (and this chart: http://en.wikipedia.org/wiki/Piano_key_fr

I used this tuner to test it: http://www.audionotch.com/app/tune/ http://www.audionotch.com/app/tune/ (and this chart: http://en.wikipedia.org/wiki/Piano_key_frequencies http://en.wikipedia.org/wiki/Piano_key_frequencies) Seems to work well! Good work.