Hello,
I have been using the midi output for the signal strength to determine when netstumbler is freezing (the tones stop changing when netstumbler freezes - I am still working on fixing the freezing problem) and the chords that result are quite unpleasant to listen to for any length of time, especially if you are musically oriented.
If you made the midi output follow a 'pentatonic' scale, the resulting output would naturally result in harmonious chords - it is the scale that all windchimes use.
Here are two sites with some pentatonic scales:
http://www.geocities.com/trollstjerne/pentatonic.html
http://101windchimes.com/penta.html
Here is a windchime site that lists the notes of the chime as well as letting you listen to them:
http://www.wind-chimes-free-shipping.com/wind-chimes-shop/en-us/dept_4.html
Basically, you would just program the midi output to skip certain notes, and then repeat the pattern octave per octave.
Changing the midi notes to some kind of natural chords would make using the midi signal strength output much more pleasant to listen to.
Thanks for a great program!