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Using this app you can tune almost all string instruments!
It offers the possibility to listen the sound of each tuning string and check & fine-tune the strings with the help of the chromatic tuner, placed in the middle of the app window!
App-features:

• Chromatic tuner with audio-input and microphone support,
• 11 supported instruments: Guitar, Violin, Mandolin, Bass Guitar (4 and 5 String), Viola, Balalaika, Ukulele, Cello, Dombra, Banjo and Double Bass,
• Tone generator with authentic instrument sounds,
• Automatic repeating of the playing sounds,
• 11 pitches modes:

• Baroque,
• Scientific,
• France1859,
• New Philharmonic,
• Concert Pitch,
• Boston Symphony Orchestra,
• New Berliner Philarmoniker,
• Moscow Theater,
• Old Berliner Philharmoniker,
• Old Philharmonic,
• Renaissance.