I follow on from my comments above, and further to looking at the info referred to by Eddie regarding the Widi system, I remain somewhat sceptical about the idea of converting an audio file to midi.
So it remains that I would just LOVE to study a midi file so converted. Great to compare the original .WAV (or .MP3 or whatever) and the immediate midi file, before it's been touched by human intelligence. I still suspect that there are serious limitations with what can be achieved.
Way back in October 1992 I got a Roland unit, a CP-40. This box has a socket to plug in a microphone or (I think) a guitar. The unit also has a standard midi connector, and a couple of slider controls for (I think) volume and something like 'threshold'. You could then make sounds into the unit, and capture the resultant midi on a connected computer. The unit did work, it did produce midi data, but it was pretty useless data. Too much of some aspects, not enough of others. I still have the unit, packed back in original box, in the garage Maybe one day I'll try it again. I understand that this unit was FAR from 'clever', and I'm sure that the software with the Widi system is massively more advanced, but even so I'd need to see something more that some marketing hype (?)
Has anyone used the Widi system. I note there is a stand-alone version as well, i.e. NOT a plugin. This would be more appropriate to me.