how to hear reference tones?
- slide the left mode change slider to sound
- press the note up/down buttons to change note
frequency calibration? 440Hz ~ 445Hz
- press the pitch button, the frequency rotates from 440Hz to 445Hz
how to change instruments?
- press the instrument button, the instrument type rotates among piano, guitar, sine-wave
musebook metronome m30 is the most accurate metronome for iPhone and iPod touch, and m30 is very useful for professional musicians. (If you want a pendulum style, get m30 pendulum style)