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A4tune uses <a href="https://www.netlib.org/fftpack/">jfftpack</a>:
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jfftpack is a Java version of fftpack. jfftpack is based on Paul N. Swarztraubre's Fortran code and Pekka Janhuen's C code.
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The translation to Java was done by Baoshe Zhang.
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The original fftpack was public domain, so jfftpack is public domain too.
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Alberto Nudman for Spanish translations.
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Albert Vitó i Godina and Xavier Conde Rueda for Catalan translations.
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Arseny Plokhikh for Russian translations.
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Eduardo Klosowski for Brazilian Portuguese translations.
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Eugene Sizov and Oleksandr Rizun for Ukrainian translations.
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Francesco Rotondella for Italian translations.
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Fuat Filizkol, Seckin Şahbaz and Tamer Karabulut for Turkish translations.
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Hegyi Zoltán and Stolczenberger Róbert for Hungarian translations.
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Jean-Marc Lartigue for French translations.
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Jędrzej Wojtkowiak, Maciej Michalczyk, Marcin Skulski and Paweł Marciniec for Polish translations.
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Jim Harris for corrections of the English texts.
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Finnish translator who prefers anonymity for Finnish translations.
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Konstantinos Bedoya for Greek translations.
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Mike Ho @HK for Chinese (Traditional) translations.
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Christian Frank, Peter Hahn, Axel Matthia and Mark Paede for German translations.
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Richard Boer for Dutch translations.
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Taeyeong Kim for Korean translations.
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Takayuki Gunge and Tamaki Gunge for Japanese translations.
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Vincent Mozdík for Slovak translations.
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Play the corresponding string, and <b>tune up or down</b> using the appropriate peg on your instrument. <b>Then use the Strobe view for fine-tuning</b>.
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When the desired note is to the right of the indicator, it means the <b>pitch is too low</b>, and you need to <b>tune up</b>:
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Multiple failing checks
The translations in several languages have failing checks
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When the desired note is to the left of the indicator, it means the <b>pitch is too high</b>, and you need to <b>tune down</b>:
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Multiple failing checks
The translations in several languages have failing checks
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Now you can <b>fine-tune using the Strobe view</b>, but you have already achieved very good precision:
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Multiple failing checks
The translations in several languages have failing checks
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When tuning manually, first select the desired note. Then play the corresponding string and observe the feedback.
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Adjusting the Octave and Note
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To adjust the octave, use the upper buttons. To change the desired note by a halftone, use the lower buttons. The current note is displayed in the middle of the screen:
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Multiple failing checks
The translations in several languages have failing checks
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Selecting a Note within an Octave
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To select a note within the same octave, simply touch it:
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Multiple failing checks
The translations in several languages have failing checks
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If you prefer to tune by ear, you can also use the tuner to play reference notes. The generated notes are based on the concert pitch frequency selected in the Settings.
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The Strobe tuner is highly sensitive and is <b>best for fine-tuning</b>.
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If the pattern moves to the left, it indicates that the <b>pitch is too low</b>, and you need to <b>tune up</b>:
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Multiple failing checks
The translations in several languages have failing checks
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If the pattern moves to the right, it indicates that the <b>pitch is too high</b>, and you need to <b>tune down</b>:
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Multiple failing checks
The translations in several languages have failing checks
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If the pattern remains still, the string is in tune:
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Multiple failing checks
The translations in several languages have failing checks
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The <b>Beats per minute (BPM)</b> indicator in the center of the screen displays the tempo of the metronome when started using the "Start/Stop" button.
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The desired BPM can be set by scrolling or using the buttons next to the indicator.
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The option to choose different time signatures (Beats per bar) and accents (Clicks per beat), located above the buttons, allows you to customize the metronome pattern for your practicing needs.
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The <b>Start / Stop</b> button turns the clicking sound on or off as needed.
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The button resumes the clicking from where it was last stopped, so if you configured four clicks per beat, and you stopped after the second click, it will continue with the remaining two clicks when started again.
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The <b>Tap tempo</b> feature lets you set the metronome's tempo by tapping the button in time with the desired beat.
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Tap the button to match the rhythm, and the metronome will adjust its BPM accordingly.
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This feature provides a convenient and quick way to set the tempo without having to manually adjust the beats per minute value.
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