Great, but not worth the cost.
The slow down and pitch shift features are great.
The voice reduction is nice, but limited tremendously by the recording quality and amount of vocal reverb/delay.
Also, the chord guessing feature is only sometimes nearly correct.
The worst thing about the app is that the entire build in chord library is wrong. All of the chords are written into the diagrams incorrectly. This would be a great app for beginner except that its teaching everything incorrectly. Im almost thinking that the app was geared towards guitarists but made by someone who doesnt play much guitar.
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Capo - Learn Music by Ear