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Tuning Your Sanshin
The general tuning for the Sanshin is called Honchoshi.
The common tuning is CFC.
Top String C, Middle String F, and Bottom String F.
You Can Purchase a Sanshin Tuner here
However it is ideal to adjust the tuning to match your singing tone.
Other common tunings are B E B and A#D#A#.
See the video for a BEB Tuning, and another interesting video on the basics of the Sanshin.