- good to have no sound when wrong key is pressed
- no waiting.
- no iphone version on 2013 sep. Take $20k to write one app. Use pre release user money. Look like sell very little. Founder could not program.
- keyboard is cheap. White key not stable.
- could not learn to play any song after 30 min. What I want is to play song and not read music.
- tempo control is good.
- score is good.
- power key is difficult to use. I only use battery for caution.
- a line to color key.
- most midi files contain guitar. Need to refine it. Too complex for beginner.
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