Looper pedal: A looper pedal or "phrase looper" allows a performer to record and later replay a phrase, riff or passage from a song. Loops can be created on the spot during a performance (live looping) or they can be pre-recorded. By using a looper pedal, a singer-guitarist in a one person band can play the backing chords (or riffs) to a song, loop them with the pedal, and then sing and do a guitar solo over the chords. Some units allow a performer to layer multiple loops, enabling the performer to create the effect of a full band. The first loop effects were created with reel-to-reel tape using a tape loop. High-end boutique tape loop effects are still used by some studio producers who want a vintage sound. Digital loop effects recreate this effect using an electronic memory.