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The FireWire output from the computer may be brought back straight into a channel strip for easy mix integration. FireWire aggregation allows multiple Onyx 1220i mixers to be connected. Each mono channel has an Onyx mic preamp, phantom power, an input Gain control with 60 dB of gain, a sharp 18 dB/octave, 75 Hz Low Cut filter, Pan, Mute, Solo, a 60mm fader and a Channel Insert jack for connecting an external processor. There are built-in DIs on the first two channels for direct connection of gui