Dynamics Plug-Ins : Channel Strip : Input : Phase Invert

Phase Invert
The Phase Invert button at the top of the Input section inverts the phase (polarity) of the input signal, to help compensate for phase anomalies that can occur either in multi-microphone environments or because of mis-wired balanced connections.
To enable (or disable) phase inversion on input:
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Click the Phase Invert button so that it is highlighted. Click it again so that it is not highlighted to disable it.