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The audio mixer shall have a rack-mountable frame which accommodates 16 stereo input channels, 2 main output channels and 2 alternate output channels. Each input channel shall be capable of accepting either stereo or monaural signals, and shall be fitted with stereo level, equalization, balance, solo, muting and auxiliary send controls, level-indicating (-20) LEDs and overload (O/L) LEDs. Input channels 1 through 4 shall each be fitted with left and right insert jacks. The main output channels s