Temperament Piano Pro (com.MusicalSoundLab.TempPiano) on Google Play

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com.MusicalSoundLab.TempPiano
TempPiano is an app that can be confirmed three temperament(equal temperament, just intonation, Pythagorean) at the same time.You can also change A pitch, base tone, and volume.The free version only work for 30 seconds after starting the application, The paid version work unlimitedly.To know how to use, please refer to the youtube video.