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Connecting signals to both types of inputs on any one channel (MIC and LINE in) is not recommended. To do so may change the gain of the input circuit. Note: You may connect a stereo source to channels 1 through 6 but you must use two channels, one for left and one for right and Pan appropriately or sum to mono using a ‘Y’ cable. 2. Channel 1-6 TRIM Controls and SET LEDs The first 6 mono channels of the M810/M1610 have been equipped with an input TRIM control and are also protected by an overload