Abstract: A foot pedal actuator is secured to legs of a portable musical instrument using a first elongate member having an aperture for a leg to pass through on one end, and an aperture for securing to a foot pedal actuator fastener aperture on the opposite end. A second elongate member has an aperture which is secured to the foot pedal actuator aperture on one end, and a rotatable attachment to the first elongate member along the span of the first elongate member. A third member similar to the first member and fourth member similar to the second member secure the four corners of the foot pedal actuator to two feet of the portable musical instrument, which pass through the leg apertures of the elongate members.

Abstract: An improved sensor for detecting vibrations uses a flexible moving beam supported by two flexible leg members. The flexible moving beam can be moved in two directions. A protrusion extends from near one end of the flexible moving beam. The protrusion is placed against a transducer element 22 which is against a rest element 24 . When the moving beam is moved parallel to its length, the protrusion is pushed against the transducer element 22 and against the rest element 24, thereby generating electrical signals. When the moving beam detects vibrations in a direction perpendicular to its length, the protrusion is rotated upward and outward and pushes against the transducer element 22, causing the generation of electrical signal. The improved sensor is particularly adapted for detecting vibrations from a stringed musical instrument.

Abstract: An apparatus for adjusting the height of a piano pedal includes an assembly member provided at the proximal end of a pedal, a support member provided at the distal end of a pedal frame, the support member and the assembly member being movable in the vertical direction relative to each other, and an operation bolt in thread engagement with a screw hole formed in the support member in the vertical direction, a head portion of the operation bolt being pivotally supported at the lower portion of the assembly member.