glossary
Mono summing shows what survives when the stereo field collapses to one channel.
Mono summing combines the left and right channels into a single signal. Anything shared between the channels tends to remain stable, while out-of-phase information can weaken or disappear.
This is why a mix can sound wide in stereo but lose vocals, bass, or effects when played through mono systems.
Check whether the vocal stays forward, the kick and bass remain solid, and important hooks still read clearly. Small tone changes are normal; disappearing elements are a warning.
Correlation meters can point toward risk, but mono listening confirms whether the risk matters musically.
Reduce extreme widening, adjust phase alignment, narrow low frequencies, or rebalance the arrangement. The fix depends on what collapses.
Meter Core links correlation and M/S context so mono checks become part of the mix workflow rather than a last-minute surprise.