The Projectron is a device built by Alan Parsons as an analog sample playback device, similar in general concept to a Mellotron.

Other artists have employed similar techniques of recording looped sounds to a multi-track tape, and then "playing" melodies from the tape by manipulating a mixing console's faders while the tape plays. Lol Creme and Kevin Godley used such a technique to produce the backing vocals on the 10cc song "I'm Not In Love".