Well executed app. I would love to see some exercises that also focused on the "spelling" of the intervals. For example, app plays a major or minor chord or arpeggio and then tells you what one of the notes was (eg middle note is E). Then you must identify the chord (eg C major, or C# minor depending on whether you heard a major or minor chord). I would also like the ability to enable a timed test mode where a configurable number of seconds is available to answer before you get it wrong. Even something as simple as showing how long it took to answer all 15 questions in a section would be useful.
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