CHECK

See where your stereo falls apart.

Real-time correlation across 40 frequency bands. Bass-weighted scoring tells you what will survive a club system, not just a single number.

See what your mix looks like in mono.

CHECK analyzing a stereo mix. The correlation curve shows safe frequencies in green and problem areas dropping into the red zone.

Features

Spectral correlation curve

• See mono compatibility across 40 frequency bands in real time. Not just a single number — a full picture of where your stereo image holds up and where it falls apart.

Bass-weighted score

• The score weighs low frequencies 3x heavier than highs — because that's where mono collapse actually hurts. If your bass drops below 60%, your low end won't survive a club system.

Frequency-focused analysis

• The FOCUS knob lets you zoom into LOW, FULL, or HIGH frequency ranges. isolate your bass mono compatibility or check just the stereo highs.

Instant mono and side monitoring

• MONO button collapses to mono so you hear the damage. SIDE button solos the difference signal — everything that disappears in mono, isolated.

Colour-coded curve and bar chart view

• The correlation curve changes colour as it crosses zone boundaries — mint where you're safe, amber for caution, red for phase cancel. Flip to bar chart mode via the right-click menu to see all 40 ERB bands as discrete coloured rectangles. Spot a single problem frequency at a glance.

Smart education that names the frequency

• Instead of generic warnings, CHECK tells you exactly what's happening: "phase cancel around 80 hz. Often an out-of-phase kick and bass relationship." Three message variants per problem rotate as you iterate, so you learn three common causes per region. Bass is treated as more critical than highs because that's where mono collapse actually hurts.