An embodiment of the present disclosure provides a portable electronic musical instilment, including a press module, a control module, an angle detection module, and an audio play module; the press module is arranged above the control module; the angle detection module and the audio play module are respectively connected to the control module; the angle detection module is configured to detect a rotating angle of a portable electronic musical instrument body; the control module is configured to adjust, according to the rotating angle detected by the angle detection module, different registers; the press module is configured to receive a press event of a user; and the audio play module is controlled by the control module to play tones of different musical scales.

A set of new accessories for the violin family instrument, switch fingerboards, which includes an assembly of switches, suitable for violin learners. Switches are laid out regularly on the spots corresponding to the notes which are written on the fingerboards. Once a switch is turned on (pressed by a finger), a CPU will be triggered, and then output of the signal of a desired pitch will immediately cause the speaker to produce a sound of that pitch. Such a switch fingerboard will surely assist beginners to practice how to stop strings and to shift positions to get pitches more precisely and efficiently. Additionally, an n-like, switch assembly fingerboard is described, where all the switches are embedded into a rectangular plate in equal intervals. With the same CPU, ROM, amplifier and speaker system, any sound recorded from a performance in the violin family, corresponding to each note, can be replayed on command.

A set of new accessories for the violin family instrument, switch fingerboards, which includes an assembly of switches, suitable for violin learners. Switches are laid out regularly on the spots corresponding to the notes which are written on the fingerboards. Once a switch is turned on (pressed by a finger), a CPU will be triggered, and then output of the signal of a desired pitch will immediately cause the speaker to produce a sound of that pitch. Such a switch fingerboard will surely assist beginners to practice how to stop strings and to shift positions to get pitches more precisely and efficiently. Additionally, an n-like, switch assembly fingerboard is described, where all the switches are embedded into a rectangular plate in equal intervals. With the same CPU, ROM, amplifier and speaker system, any sound recorded from a performance in the violin family, corresponding to each note, can be replayed on command.

At least one electronic signal is converted into at least one electromagnetic field, where the electronic signal may be created or modulated by environmental, interactive, and programmed inputs. The at least one electromagnetic field vibrates a ferromagnetic element creating an acoustic sound and optionally a transducer converts the vibration into an electronic signal for processing.