glossary
Mono checking shows what survives when left and right are summed together.
Mono checking means listening to the mix with the left and right channels summed to mono. It reveals whether important parts disappear, shift level, or become hollow.
The test is useful because many playback situations reduce stereo information or place listeners off center.
Wide effects, doubled parts, stereo bass, and polarity mistakes can lose energy in mono. A part that sounded huge in stereo may become weak or vanish.
Mono does not need to sound identical to stereo, but the song should still feel balanced and intentional.
Toggle mono briefly while balancing vocals, kick, bass, and important hooks. If something collapses, inspect phase, panning, and stereo widening choices.
Meter Core helps pair mono checks with stereo correlation and balance so compatibility problems are easier to spot.