Re: Converting Audio to MIDI
Unfortunately, there's no really good way to convert audio to midi. With monophonic audio it's a little easier since you're only expecting one pitch, but with polyphonic audio, not only is the number of pitches difficult to determine, but even if the number of pitches is known, detecting pitches in polyphonic audio is not an exact science. Instruments also cannot be determined, and non-melodic audio such as drums or background noises or anything else might be detected as notes. So whether one of those solutions is worth the price? Depends on how accurate a job you expect. If you want super accurate, most things won't come close. It'll also depend a great deal on what you're trying to convert.
On the subject of polyphonic pitch detection, the detection of chords seems to be more accurate than individual notes, because chords have frequency patterns that pitch detectors look for.
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