MonoSafe shows phase where problems actually happen. The Phase Map breaks the correlation between left and right into 31 third-octave bands over a Mid and Side spectrum, and three band cards (Low / Mid / High) tell you at a glance whether each band is mono-safe, how many decibels it loses when summed and whether the low end plays out of phase. The lows are judged the strictest — 808s, kicks and bass have to work on phones, in clubs and on the radio. The hint line points at what to check (polarity, bass layers, overly wide effects) instead of promising a magic fix. The fixes don't break anything else: polarity invert for L and R, Bass Mono with a 24 dB/oct Linkwitz-Riley crossover (drag it right on the display), overall width plus separate width for lows, mids and highs, and Guard, which pulls the chosen bands toward mono only when their correlation drops below your target. Width and Bass Mono only touch the Side channel — the mono sum stays exactly the same, and Peak Safe makes sure neither widening, Bass Mono nor crossover phase pushes peaks above −0.2 dBFS (or above the input peak). Stereo / Mono / L / R / Mid / Side monitoring works like a studio monitor controller (the meters always see the stereo output), and the phosphor vectorscope, correlation meter with minimum hold, balance, mono loss and Side/Mid ratio read like a professional meter. At neutral settings audio passes bit-for-bit (constant 1 ms latency, compensated by your DAW) — leave it on the master as a permanent check. Presets for bass and 808s, drums, synths, vocal FX and the master bus.