App Profile: Tonica - Harmonic training

Tonica is an app for harmony training. With simple operations, you can efficiently practice singing and instruments.

Features:
* 5-octave keyboard
* Reference pitch selection from A=410-463Hz
* Tuning options: Equal temperament, Just intonation major, Just intonation minor
* One-touch chord playback
* Sustain function that keeps notes playing even after lifting fingers from the keyboard
* Transposition function
* Metronome function