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20 mm sliders with center detents used throughout . Output level matching controls with 0 to 10 dB range . Bypass and Range buttons with LED indicators; Range buttons allow ±6 dB or ±12 dB slider adjustment . Low Pass and High Pass buttons (RR-215) or sweepable controls (RR-131, RR-231) . Clip LEDs indicate overload conditions . Unbalanced RCA, as well as balanced 1/4" TRS phone andXLR connectors, for allinputs and outputs . Ground lift switches . Dual voltage switch (100/120 or 200/240 VAC) DES