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Just slide it into your rack, apply power and signal, and listen. There is only one control on it. The switch on the front panel bypasses the device when it is switched to the right, and passes signal through it when it is switched to the left.
The rotator is an all-pass filter that alters the phase of each component the signal differently depending on its frequency. If a 50 Hz signal is passed through, it will come out with identical polarity on the output. But, if an 800 Hz signal is passed through it will come out with the polarity completely reversed. A side effect of this adjustment is to make the waveform more symmetric.
This is what it does. The top waveform is a typical female vocal recorded with Neumann U87. It's asymmetric, with peaks in one direction greater than in the other, because the human vocal cavity is just that way.
The bottom waveform has been processed by the phase rotator. It's more symmetric, with peaks more evenly distributed between the top and bottom of the waveform. This means when you limit it, the limiting will be more even between the top and bottom, and you can limit it more aggressively without distorting it. It is especially useful on severely asymmetric waveforms like brass instruments and vocals.
There's no magic to it, but in the modern day when everyone is trying to eke out every little bit of loudness in their tracks, the phase rotator can help you bring vocal levels up a tiny bit and keep vocals front and center in your mix. It's a great help in getting the radio-ready sound. And it is available right now at your dealer for $299.