Great work  

   I tested it and I got good results

for the c523.wav I got 523 +00c only the second Zero twitched a few times though

for the a440.wav I got 440 +00c only the second Zero twitched a few times


I think this is a very good app for the Ds and I would like to see this go far.The Oscilloscope on the Top Screen was a cool touch  and I also needed a Guitar Tuner too

  Thanks