A mix signal on a mixer designed to provide a feed to monitor speakers separate from the main speakers. This allows a different mix (of input signals) to go to the monitor speaker than the main house mix. Also called foldback or auxiliary. Depending on the operator, the performer, and the console being used, the monitor sends may be pre-fader or post fader. Most typical is pre-fader which keeps the level of the monitor mix the same, regardless of where the fader is set. Post-fader sends vary the output to the monitor mix based on the fader setting.