Double-stop ViolinTuner

Calculate the frequency of the perfect fifth on the basis of the frequency of the A, TuningToneForViolin synthesizes sine, triangle, sawtooth.
I assume that you are such usage of the pitch pipe.
The layout is easy to operate, even while holding a musical instrument.
I think for other frequencies does not include pure sine wave, swell of sound of double-stop shifted even a beginner is felt, and can be tuning well.
G Sound of the sine wave so difficult to hear in the built-in speaker, please try "octave" the (sin wave).