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If you have a foh and monitor desk set up sharing the same input rack as there are not 2 separate head amps in the mix rack only one surface can be in control at once, Logical. So the deal would be one surface sets a reasonable amount of analogue gain for the channel then both surfaces switch to using Trim which gives + and – 24dB of digital gain to that channel. This prevents the monitor guy turning up the channel gain and affecting the FOH guys world or Vice Versa. Works like a dream.