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For the best possible sound and lowest noise increase the input level control until the input LED lights occasionally. CH2 (4): Controls the input level (volume) of the microphone connected to Input CH 2 (13). Zero is the lowest (quietest) setting, 10 is the highest (loudest).For the best possible sound and lowest noise increase the input level control until the input LED lights occasionally. OUTPUT LEVEL LED INDICATORS (5) For the best sound increase the INPUT LEVEL of CH1 (3) and/or CH2 (4) so