Maestro has been designed as a easy to use tool for musicians. It can provide a single tuning note (any note of the chromatic scale in the octave above middle C), a tuning tool for instruments (Violin, Viola, `Cello, Guitar, Concert A, Middle C, B flat, E flat) and a Metronome (32-250 bpm, with 1-9 beats per bar (measure if you are from the US!) v1.2 improves the PitchPipes usability. Free to good homes, but consider donation if useful (see ABOUT screen) Tested with SE K750i, Moto K1, but will more likely than not work with other handsets.