Here’s what they have to say about MIDImorphosis for OS X:
Plug an ordinary guitar into your Mac through an appropriate audio interface, and set MIDImorphosis to receive audio from there. The pitch of your guitar playing will be converted to MIDI, which can then be routed synthesizers, sequencers, or DAWs such as Logic and Ableton.
The app features the innovative Spectral Eye display; it shows the frequencies present in the incoming audio signal, arranging them in a spiral that maps to musical pitch. You can see the actual tone of your guitar, and the harmonics, in a way that is not possible with a traditional FFT display.
The app features four different pitch tracking modes, to match different styles of play. If you play single notes very quickly in the upper register of your guitar, you can use very fast tracking; high pitched notes can be identified more swiftly than lower notes, and the app can take advantage of this. If you play in lower registers, and need accuracy more than speed, change the settings to either fast or standard pitch tracking. If you play bass, you can still use the app — tracking is slower, but should still be reliable and accurate.
Pitch tracking works best with monophonic notes, but you an also set the app to detect chords and intervals. You may need to adjust your playing style, and mute notes with your palm to get the best results. The app does not track as accurately as dedicated hardware systems, but you’ll be amazed at what it can do for the price of a pack of strings.
MIDImorphosis lets you easily transpose the MIDI up or down multiple octaves; if you want to play a quick bass line, simply play the notes you want in the upper register of your guitar, and transpose them down for a synthesizer.
MIDI can be sent to any destination; the app works well with Logic, GarageBand, Ableton, and more. You can use the app to play live, or record the MIDI for transcriptions or later editing.
If you’ve used MIDImorphosis, leave a comment and share your thoughts on it!