Mix Doctor tells you what's wrong with your mix and fixes it right away. Put it on the master or on a beat, press play, and it compares the mix with a genre profile (Trap, Drill, Hip-Hop, Pop, Electronic, R&B, Lo-Fi, Rock, House, Drum & Bass, Phonk, Acoustic) and applies its Treatment: Fix pulls the balance of eight bands toward the profile (too much warmth and mud — down, not enough top — gently up), Mud cuts 250–500 Hz build-up, Harsh tames piercing 2–5 kHz only in the moments it hurts, and Low keeps booming 808 notes in check and makes the bass mono below 120 Hz. The defaults already make a clear improvement, and Auto Gain keeps the input loudness — you compare the sound, not the volume. Zero latency; Treat Off = bit-perfect audio. The “What the treatment changes” strip shows live how many dB each band gets (Sub, Bass, Warm, Mud, Mid, Presence, Brilliance, Air) and how much Mud, Harsh and Low are cutting, and a green correction curve sits on the spectrum. On a muddy, harsh beat the average deviation from the Trap profile drops from 2.8 to 2.1 dB, and the mud excess in loud moments from +4.4 to +2.0 dB. The diagnosis is still there: concrete advice in English and Polish with a measurement, advice, confidence and the band highlighted — band balance, low-end build-up, muddy mids, harshness, kick-vs-808 masking, stereo and mono, True Peak, clipping, EBU R128 loudness, PLR and PSR, balance over time. A/B snapshots of mix stages and a .txt report.