Auto Chord app for iPhone and iPad

Auto Chord is a "chord follower" that automatically generates chord accompaniment from live music. Unlike apps that require the user to manually program a sequence of chords, Auto Chord automatically detects chord notes and uses the information to control a pad synth, which is included in the app.

The chord detector uses a model based approach to pick the best chord based on harmonic similarity and complexity. User controls include trigger level set sliders (note on/off levels), and a list of the types of chord to use (e.g., major, minor, 7th, diminished, etc.).

The internal pad synth is based on our xMod FM synthesis technology. A touch sensitive sound space controls timbre of the instrument. Other controls change register, decay, and portamento.

MIDI is sent on channel 1.

N.B. Although the app works with most music, it is essential the music be "in tune" (A4 = 440 Hz). It is also best to minimize percussion and ambient noise.