The Autoharp Keyboard Mechanism is engaged with an autoharp having strings. Octave bars having piano-like keys are slidingly engaged with pins extending from the top surface of the autoharp and are located above the strings. Damping brackets are also slidingly engaged with the pins and are located beneath the octave bars and beneath the strings. Coil springs are arranged around each of pins and are located beneath the octave bars and the damping brackets. Adjustable length spacers are engaged with the octave bars and with the damping brackets, one at each end of the octave bars and damping brackets. The adjustable length spacers are located between the octave bars and the damping brackets, and are engaged with the octave bars using threads. Holders are configured to retain the octave bars on the pins.

A mute for a stringed instrument includes a muting material. The muting material includes a plurality of string-receiving recess portions extending substantially parallel to one another and into the muting material. The plurality of string-receiving recess portions is operable to receive a plurality of adjacent strings of the stringed instrument and the plurality of adjacent strings may be configured to be spaced apart from each other at variable widths. The muting material may include a grasping portion.

A mute for a stringed instrument includes a muting material. The muting material includes a plurality of string-receiving recess portions extending substantially parallel to one another and into the muting material. The plurality of string-receiving recess portions is operable to receive a plurality of adjacent strings of the stringed instrument and the plurality of adjacent strings may be configured to be spaced apart from each other at variable widths. The muting material may include a grasping portion.

An accessory for changing the timbre of a stringed instrument is provided, comprising a body having a vertical opening and a horizontal slot formed in the bottom surface from one edge into the vertical opening; an adjustment rod within the horizontal slot; and a dampener within the vertical opening associated with at least one string of the stringed instrument to which the accessory is attached. The adjustment rod has an upwardly angled inner end within the vertical opening in the body. The dampener comprises a dampener body; a soft fabric covering a top surface; and a bottom surface having a horizontal groove with a downwardly angled top surface matching the angle of the angle of the adjustment rod. Moving the adjustment rod inwardly moves the dampener upward and applies pressure to the string; moving the adjustment rod outwardly moves the dampener downward and reduces the pressure on the string.

An accessory for changing the timbre of a stringed instrument is provided, comprising a body having a vertical opening and a horizontal slot formed in the bottom surface from one edge into the vertical opening; an adjustment rod within the horizontal slot; and a dampener within the vertical opening associated with at least one string of the stringed instrument to which the accessory is attached. The adjustment rod has an upwardly angled inner end within the vertical opening in the body. The dampener comprises a dampener body; a soft fabric covering a top surface; and a bottom surface having a horizontal groove with a downwardly angled top surface matching the angle of the angle of the adjustment rod. Moving the adjustment rod inwardly moves the dampener upward and applies pressure to the string; moving the adjustment rod outwardly moves the dampener downward and reduces the pressure on the string.

A mute for a bowed stringed musical instrument. A main body with a string glide opening receives an instrument string, and a three-dimensional array of cavities is encased within the main body. A clamping tongue establishes a channel between the clamping tongue and the main body, and a three-dimensional array of cavities is encased within the clamping tongue. The arrays of cavities are separated by an interior acoustic wall that can traverse generally in a longitudinal direction and that can have a portion contiguous with the channel. The arrays of cavities can be defined by matrices of material formed by plural layers of material, such as plural layers of filamentary material, joined through three-dimensional additive manufacturing. Plural different materials can be joined through three-dimensional additive manufacturing to form portions of the mute. The string glide opening can be teardrop-shaped and can receive a string through an S-shaped string insertion slot.

A mute for a bowed stringed musical instrument. A main body with a string glide opening receives an instrument string, and a three-dimensional array of cavities is encased within the main body. A clamping tongue establishes a channel between the clamping tongue and the main body, and a three-dimensional array of cavities is encased within the clamping tongue. The arrays of cavities are separated by an interior acoustic wall that can traverse generally in a longitudinal direction and that can have a portion contiguous with the channel. The arrays of cavities can be defined by matrices of material formed by plural layers of material, such as plural layers of filamentary material, joined through three-dimensional additive manufacturing. Plural different materials can be joined through three-dimensional additive manufacturing to form portions of the mute. The string glide opening can be teardrop-shaped and can receive a string through an S-shaped string insertion slot.

A sound-hole cover includes a frame member, insert member, and foam spring members. The frame member has a rim and a front surface that is recessed from the rim. The frame member also has a plurality of spring-loaded orifices and a back surface of the frame member has a plurality of spring member holders opening radially outwardly from a center point of the frame member. An insert member has a planar front surface and a plurality of pegs, each peg corresponding to one of the spring-loaded orifices such that when the pegs are inserted into the spring-loaded orifices, the insert member remains on the frame member within the rim. There are foam spring members, each foam spring member is held by a corresponding spring member holder of the frame member. The foam spring members removably hold the sound-hole cover within a sound-hole of a musical instrument.

A sound-hole cover includes a frame member, insert member, and foam spring members. The frame member has a rim and a front surface that is recessed from the rim. The frame member also has a plurality of spring-loaded orifices and a back surface of the frame member has a plurality of spring member holders opening radially outwardly from a center point of the frame member. An insert member has a planar front surface and a plurality of pegs, each peg corresponding to one of the spring-loaded orifices such that when the pegs are inserted into the spring-loaded orifices, the insert member remains on the frame member within the rim. There are foam spring members, each foam spring member is held by a corresponding spring member holder of the frame member. The foam spring members removably hold the sound-hole cover within a sound-hole of a musical instrument.

A mute for a bowed stringed musical instrument. A main body with a string glide opening receives an instrument string, and a three-dimensional array of cavities is encased within the main body. A clamping tongue establishes a channel between the clamping tongue and the main body, and a three-dimensional array of cavities is encased within the clamping tongue. The arrays of cavities are separated by an interior acoustic wall that can traverse generally in a longitudinal direction and that can have a portion contiguous with the channel. The arrays of cavities can be defined by matrices of material formed by plural layers of material, such as plural layers of filamentary material, joined through three-dimensional additive manufacturing. Plural different materials can be joined through three-dimensional additive manufacturing to form portions of the mute. The string glide opening can be teardrop-shaped and can receive a string through an S-shaped string insertion slot.