Foldback is a feed of audio to the studio, via either loudspeaker, headphone or earpiece (IEM). It may be to provide the presenter and/or performers with a Cue feed from an external source or from a singer’s Microphone, to reinforce a singer’s voice for confidence or as an aid to tuning, or to provide actors with the reproduction of recorded sound effects.

The foldback circuit may also be used for Talkback; known across the Atlantic and in OBs as ”’IFB”’ (Interrupted Foldback), in BBC terms it is simply TB to FB (talkback to foldback).