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Step By Step
01 - Insert the Widening Meter Pro on the main output bus:
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02 - Open the automation window:
03 - Choose the mid and side peak parameters:

04 - Hit play, the Mid and Side envelopes are being recorded:

05 - Stop playback, you can now check the recorded envelopes over the track:

06 - A low level for the mid channel means mono compatibility issue and phase inversion:

07 - Side signal getting low means that your sound is mono:
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08 - You can as well monitor this in real time within the Widening Meter Pro user interface:
08.1 - Hide the transformed envelopes curves since you do not need them:

08.2 - You can See the mid and side channels levels on the user interface:

09 - The RMS level can be used as well to check the perceived loudness of the mid and side channels:

10 - You can also choose to record these envelopes on a given track to monitor its stereoness right on top of the waveform:

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