Musical Keyboard: The white and black piano-style keys which the player presses connect the switches, which trigger the electronic note or other sound. Most keyboards use a keyboard matrix circuit to reduce the amount of wiring that is needed.

User Interface Software: A program (usually embedded in a computer chip) which handles user interaction with control keys and menus, which allows the user to select tones (e.g., piano, organ, flute, drum kit), effects (reverb, echo, telephones or sustain), and other features (e.g., transposition, an electronic drum machine)

Computerized Musical Arranger: A software program which produces rhythms and chords by the means of computerized commands, typically MIDI.

Sound generator/sound chip: An electronic sound module or a musical synthesizer typically contained within an integrated circuit or chip, which is capable of accepting MIDI commands and producing sounds.

Amplifier and Speaker: A low to middle-powered audio amplifier and speakers that amplify the sounds so that the listener can hear them.