I'm a violinist and engineer, and I've been developing an app to give intonation feedback. Currently the app will track whatever note(s) you play and display them like sheet music, but color-coded for intonation. It is specialized for violin, able to track double stops and vibrato.
There is a version out now for iPhone/iPad, and there's a 1-minute video in the link below that more clearly demonstrates how it works.
I'm still developing, and am trying to figure out what features people want and if there is a better interface. This has been a long-time passion of mine, so I'll keep updating this app until it is practical and useful for all violinists.
The current features includes tuning for open strings, a metronome, record/playback, and intonation feedback.
The next version will include sheet music, so I'd like to get feedback on these potential features:
A. Being able to switch from equal to just intonation (or Pythagorean). This might apply only to scales.
B. Receiving tips as you play, ie "missed accidental" or "you're rushing".
C. Evaluating song performance. Something like Guitar Hero, where you get a score at the end of a song. Possibly with a breakdown on intonation, timing.
D. Saving the audio as an MP3 or .wav (uncompressed) file.
E. Built-in repertoire. Should it focus on early songs (ie Suzuki), standard etudes, Bach solos, or major concertos?
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