Shure ANI4IN Manual page 19

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Pre-Fader (Analog Input Level)
Pre-fader metering displays the signal level before it reaches the digital gain fader, so that input signal levels can be optimized
for each channel. Analog gain adjustments affect the meter when set to pre-fader, but the digital gain adjustments do not.
Important: If the incoming signal is adjustable (wireless microphone systems, for example), make sure it is at the nominal level
before adjusting the analog gain on the Audio Network Interface.
Post-Fader (Digital Output Level)
Post-fader metering displays the signal level at the very end of the signal chain, which includes both the analog and digital
gain. Use this setting to meter the levels that are being sent over the Dante network.
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