Abstract: A tremolo lock as provided preferably to allow the operator to engage the lock or stop from the topside of a guitar and tremolo base plate completing a floating double locking tremolo system preferably for electric guitars. Many embodiments also provide calibration adjustments, mounted within the cavity of guitar body, so the operator can make adjustments while the tremolo is floating, to the preset pitch tuning level position of the tremolo system such as, after a string breaks to return the remaining stings back in tune. Calibration adjustments for tuning can also be made when in the lock or stop position therefore altering and adjusting the preset pitch tuning. Many embodiments of the present invention provide the ability to easily disengage the lock or stop and return the tremolo system back to a floating position.