Rocktron Prophesy II User Manual page 94

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As you tune the string, the displayed asterisk will move closer to the
displayed note. When the plucked note is perfectly in tune with the
note that is displayed, "TUNED" will display at each side of the note, as
shown below.
FLAT TUNED- C -TUNED SHARP
A plucked "C" note that is perfectly in tune
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