The Correlation Meter in Logic Pro measures the phase relationship between the left and right channels of a stereo signal. It helps determine whether your mix is mono-compatible, whether elements are out of phase, and how wide (or narrow) your stereo field truly is. The meter displays a single needle or bar that moves between –1 and +1, giving an instant visual readout of phase coherence — essential when widening sounds, layering microphones, or preparing a mix for playback on different systems.

Key Features

• Simple –1 to +1 Display: Shows how in-phase or out-of-phase the stereo signal is.

  1. +1 = fully in-phase

  2. 0 = neutral / wide stereo

  3. –1 = fully out of phase (danger zone)

• Real-Time Visual Feedback: Helps quickly identify problem areas when mixing with stereo wideners, multiple mics, or modulation effects.

• Mono Compatibility Check: Ensures your mix won’t collapse or lose key elements when played on mono speakers or phones.

• Great for Multi-Miked Instruments: Especially useful for drums, amps, orchestral recordings, and layered vocals.

Best Use Cases

• Ensuring Mono Compatibility: Check if your mix or specific tracks retain clarity and punch when summed to mono.

• Detecting Phase Issues: Useful when combining multiple microphones on one source (drums, guitar cabs, choirs).

• Evaluating Stereo-Widened Sounds: Check that wideners (chorus, microshift, stereo delays) aren’t pushing the mix into phase cancellation.

• Mastering & Final Checks: Ensures the entire mix has healthy stereo width without problematic phase interactions.

CORRELATION METER PLUG-IN ONLINE MANUAL