| 摘要 |
A finger guide plate comprising a fret plate; a circuit board coupled to a bottom of the fret plate; and a support plate including fret relief notches coupled to a bottom of the circuit board. A learning apparatus for a stringed instrument comprising a replacement fret board designed to rest between an existing fret board and a plurality of strings of the stringed instrument; means for controlling an indicator coupled to the replacement fret board; wherein said indicator displays which of the plurality of strings of the stringed instrument is to be played.
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