What Moog did, in 1964, was to produce and market a practical instrument, a small keyboard synth which could be used with relative ease.

BBC: Technical wizard: Bob Moog

You generally play a software synth using an external music keyboard plugged into the Mac via some variety of MIDI (Musical Instrument Digital Interface) hardware device for connecting electronic musical instruments to each other and to computers.

CNN: Create your own music on the Mac

Whereupon he had demonstrated several poses: from sitting informally beside the open keyboard with a favorite song on display to standing more formally beside the instrument.

NEWYORKER: The Limner

Imagine that your PC and TV were blended into a single instrument with a big screen, a conventional remote control and a keyboard.

FORBES: The convergence gamble