Behringer DSP1124P Digital 24-Bit Feedback Suppressor/Parametric Equalizer Usable as a 2-channel feedback suppressor or 2 x 12-band parametric equalizer Two software engines allow independent or coupled functions on left and right channels Three filter modes, selectable per filter Single-Shot mode automatically searches and attenuates feedback frequencies and locks the filter until manually reset Auto mode continuously monitors the mix, resetting filters automatically as required