The Sound2MIDI program seems to be defunct. The original home site was a UK company called AudioWorks

AudioWorks Ltd
PO BOX 9099,
London
N20 9BG
Tel: +44(0)181-445 4331
FAX: +44(0)181-445 4442
Internet: http://www.audioworks.com

but the site seems to be gone and I assume the company is as well. I was able to find a demo version of Sound2MIDI from 1998 but nothing more recent.

There are some programs that seem to do the same trick—listen to a music source and generate MIDI—but I haven't yet tried them out. A couple of sites are Solo Explorer and intelliScore.

The idea of being able to sing into your computer's microphone and generate a MIDI is compelling because it would allow everyone here to capture a melody and generate an ABC file to help fill out the melodies in the Digital Tradition. It might also make it more convenient to submit a melody together with lyrics when posting a song to the forum.

I hope some of us can make time to start playing with this capability.

      - Mark