Sir Nedwood@DrFell @Humpleupagus @EvolLove @MummaBear it's a bridge on a guitar that balances the tension on each string individually such that it's always in tune no matter what. Vibrato no longer works. If you bend a string slightly the bridge saddle moves with it and the note stays the same pitch. Metal rythym guitarists use it a lot so they can thrash around on stage without sounding like ass.
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