Turn on the microphone and play an open string: the tuner recognizes the string and tells you whether to tighten or loosen it. Tap a string to hear its note.
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Automatic string detection. Tap a string to hear it and select it.
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Tuning the string pairs
Each mandolin note is played on a pair of strings tuned in unison. Tune the two strings of a pair separately, playing only one at a time, then listen to them together: if the sound wobbles, one of them is slightly off.
The mandolin is tuned exactly like the violin, so violin fingerings carry over directly.