PRESONUS NSB Series Owner's Manual page 30

After you have set the preamp levels, enable Gain Compensation. This will turn on Gain Compensation
for that input and allow other mixers on the network to source that stream.
3.2 Remote Preamp Control (UC Surface)
Select the channel for which you'd like to set the gain.
You can now control the preamp level and
phantom power for your NSB stage box from the
Fat Channel in UC Surface, in the same way that
you control the local inputs.
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