This app is a music player that can adjust the speed / pitch / equalizer in real time for music files in the Android device. Speed : 50 - 200% Pitch : ±1 octave Main features : - This app displays a list of music files in the android terminal by "song", "album" and "artist". - Time stretch : This function can change the playback speed without changing the pitch. (50 - 200%) - Pitch shift : This function can change the pitch without changing the playback speed. (± 1 octave) - Quick jump (back, forward) : Select jump interval from 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30 sec. Please use this for learning music or voice by ear.