Constantly expanding collection of musical instrument tunings and tuning transpositions. - Play sound of each string - String count variations - Transpose from -11 to +11 semitones - A4 calibration from 415Hz to 465Hz - Scientific and Helmholtz notation - Sine, Square, Triangle, Sawtooth waveforms sounds Instruments: - Banjo - Bass - Cello - Contrabass - Guitar - Mandolin - Ukulele - Viola - Violin