In 1990 I was doing a degree couse on Electronic Engineering and for my final project I designed and built a unit which was connected to a BBC B computer. If one whistled or played a flute into the microphone, the result was staff notation on the monitor screen which could then be printed. I demonstrated the machine by using a small portable electronic keyboard with its output set to flute. I won the engineering prize and was told to 'patent it immediately'. Suffice to say it still lies on one of my shelves as the accomplishment was my satisfaction. I would have thought there would be something 'out there' which would do what I did 15 years ago. The university actually purchased the equipmant which allowed me to make a chip with the correct amount of gates for my 'invention' as nothing was available commercially.