An ampere, An amplifier, especially one used to amplify music

device for converting sound waves into electrical energy, A device (transducer) used to convert sound waves into a varying electric current; normally fed into an amplifier and either recorded or broadcast, An instrument that converts sound waves into an electric current, usually fed into an amplifier, a recorder, or a broadcast transmitter, verb_ transitive To put one or more microphones on or in

A panel of buttons used for typing and performing other functions on a computer or typewriter, Any of various instruments, played by means of a musical keyboard, often connected to a synthesizer or amplifier, device consisting of a set of keys on a piano or organ or typewriter or typesetting machine or computer or the like