Accordion tuner with scope, spectrum and strobe or staff. Can show up to eight different notes or reeds concurrently. In portrait the app shows a scope with the input signal, a spectrum showing the processed signal, the main display with the note value, cents error, frequency error etc, a strobe or staff display and a meter display showing the cents error. In landscape the app shows just the main display or staff and the meter. There is a signal indicator in the action bar which is useful in landscape mode. * 32 temperaments including Equal, Just, Pythagorean, Meantone * Filter options, including low pass, fundamental, note and octave filter * Optional strobe or musical staff display * Custom temperaments option * Transposition option * Solfège (DoRéMi) option