A holder for mounting a sensory device to a musical instrument comprises a bracket having a plurality of first connector elements, a locking mechanism for fixing the sensory device to the bracket; and a plurality of hanger members. The torsion shaft designed for the EPAS system is made up of a shaft, where a first portion of the shaft is magnetized, and a second portion of the shaft is non-magnetized. The position of the fixing unit can be set in the longitudinal direction of the hole and the hole is disposed at an acute angle to the adjustment direction of the rotor relative to the stator. Merely selecting the personal banner on the browser allows a desired linked home page which is set up by the operator to be viewed immediately. The scaling value may be applied to the red, blue, and green image signals to produce corrected image signals having improved image quality.