Casio has launched two nice iOS apps. One of them "Chordana Viewer" is a very cool app which detects the chords from an audio file.
I tested it and it got the chords right for 4 out of 5 songs. It may not be the perfect audio chord recognition out there but it definitely gives a head start for those who want to learn a new song. cool

More on this => Casio iOS Apps
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Warm Regards,
Jez

Auron Music