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The FLS indicating LEDs above each of the 62 slider lights up, lights up when the corresponding frequency is causing the feedback, you just need to reduce the offending frequency to eliminate the feedback and get on peacefully with the performance.

31+31 band, 1/3 rd octave equalizer Feedback Locating System +9dB / -6dB sliding Gain control 40Hz Low cut with LED Front panel bypass switch IN & OUT with LED 4 segment LED ladders for monitoring output Center dented controls for each channel XLR and TRS inputs and outputs Heavy-duty Internal Toroidal Transformer

REAR PANEL

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