Rocktron Prophesy II - 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