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17.Gain control knob [LINE-MIC] Adjust the gain for best S/N ratio. The output signal level from the sound sources (mic, keyboard, guitar, etc.) should be set in such a way that the output of the source should be neither too high or low. The difference can be corrected with the gain control. < Gain control rule of thumb > The gain is adjusted by rotating the [LINE-MIC] knob while watching the lighting condition of the level meter LED as the signal is input. Gain of "MIC" is obtained at full CW r