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Audio to MIDI Recorder (Version 5.0)

Audio to MIDI Recorder automatically converts songs stored in your iTunes music library to MIDI files. Uses biologically-inspired algorithms to detect and segment musical notes. It runs with full functionality on both iPad and iPhone.

Demo Video

Here's a sampling of what Audio to MIDI Recorder can do.

How to Use

Tap CONVERT to select and import a song from your iTunes music library to the app. The conversion process may take a minute or two depending on the size of the file. Avoid songs longer than 10 minutes.

Tap PLAY to expose a player toolbar at the bottom of the screen that controls the playback display. The left control starts/pauses playback. You can move to different places in the song by tapping on the left side of the display to go backwards, or the right side of the display to move ahead in the song. The slider on the right mixes the original audio (slider left) and the converted MIDI data played through an internal synth (slider right). Blending allows you to easily assess the accuracy of the conversion in order to make changes to algorithm parameters described below. Double tap the slider button to toggle the sound map that lets you change the sound of the synth.

Tap the gear icon at the top to expose the conversion toolbar at the bottom. The left button on the bottom toolbar changes the conversion options. Although some experimentation is required,

  • "o" does no time or frequency post-processing, and is best for clean fast passages
  • "|" does frequency-based post-processing, and works well on many songs, especially those with good harmonic content.
  • "--" does time-based post-processing, which often works best for polyphonic music.
POLYPHONY ("#" on the iPhone) controls the number of simultaneous notes that are recognized by the algorithm. GRANULARITY ("..." on the iPhone) controls the duration of the notes. Move this slider to the left to pick up shorter notes, and to the right for chords. Each time you change these controls the song is reprocessed and the display is updated (may take a moment, again depending on the length of the song). The action button on the bottom right generates and exports a converted MIDI file to the mail app, which can then be moved to Dropbox. Converted files can also be copied to your computer via iTunes file sharing.

The slider on the top toolbar changes the time width of the display. It does not affect audio to MIDI conversion. The vertical sliders on the right change the frequency range and do affect the conversion process, allowing you to focus on a particular range of frequencies (pitches) such as a solo instrument, a bass line, etc.

N.B. The app does not provide a clock (BPM). Exported sequences are at 107 BPM, which is determined by the app's internal time base and cannot be changed. Use an external editor to change tempo.

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