The invention discloses a western and national ensemble instrument which comprises an instrument body, and a key assembly, a matrix circuit, a main board, a function control device and a timbre control device arranged on the instrument body; the key assembly is electrically connected with the matrix circuit; the matrix circuit is electrically connected with the main board; the main board is electrically connected with the function control device; the main board comprises an electrically connected timbre device packaged with a plurality of western musical instrument timbres and a plurality of national opera timbres. Due to the fact that the timbre control device is arranged on the panel of the instrument body, the timbre control device is electrically connected with the function control device by the main board to invoke timbre information corresponding control and any matching and superposition control.

A device, system, and methods for indicating trombone slide positions is disclosed. Namely, a trombone slide position indicator is provided. In some embodiments, the trombone slide position indicator includes a slide position rod mounted in a fixed position in relation to the outer slide of the trombone. Further, a plurality (e.g., seven) slide position indicators are provided along the length of the slide position rod, wherein the positions of slide position indicators correspond to a certain pitch or note. A sensor guide is mounted to the outer slide, wherein the sensor guide moves with the outer slide and in relation to the fixed slide position rod. The sensor guide includes a mechanism for detecting and/or indicating close proximity to any one of the slide position indicators along the slide position rod. Further, a method of using the trombone slide position indicator is provided.

A device, system, and methods for indicating trombone slide positions is disclosed. Namely, a trombone slide position indicator is provided. In some embodiments, the trombone slide position indicator includes a slide position rod mounted in a fixed position in relation to the outer slide of the trombone. Further, a plurality (e.g., seven) slide position indicators are provided along the length of the slide position rod, wherein the positions of slide position indicators correspond to a certain pitch or note. A sensor guide is mounted to the outer slide, wherein the sensor guide moves with the outer slide and in relation to the fixed slide position rod. The sensor guide includes a mechanism for detecting and/or indicating close proximity to any one of the slide position indicators along the slide position rod. Further, a method of using the trombone slide position indicator is provided.