Mastering You Can See: Spectrogram, Spectrum, Quality Radar

Yesterday we updated the mastering engine — today we're showing its work. Mastering is no longer a "black box with a progress bar": every stage is visible, and the result can be inspected from five angles.

During processing: the spectrum scanner

While the engine works, a "processing beam" sweeps across your track's envelope — the processed part is recolored with the brand gradient. Below the scanner, live captions tell you what is happening right now: "Multiband dynamics: tightening the bass…", "Subharmonic: one octave below your bass…", "Export and codec check…". This is not decoration — the captions are tied to the real pipeline stages.

The A/B player: hear it and see it

The A (original) and B (master) buttons switch instantly, keeping the exact playback position — the way mastering engineers compare. While the track plays:

• Live spectrum: colored on the master, gray on the original. Switch and literally "see with your ears".
• Goniometer — a studio stereo "butterfly" in real time. Vertical = mono; the wider the cloud, the wider the stereo.

The spectrogram curtain

Two spectrograms — original and master — combined in one view. Drag the curtain with a mouse or finger and "wipe" the original into the master: you can see where air appeared above 10 kHz and where low-mid mud went away. The frequency scale is logarithmic, the way the ear hears.

The result from five angles

• Quality radar — five axes: loudness (target accuracy), dynamics, tonal balance, HF smoothness, peaks/codec. One glance shows the master's profile.
• Mastering passport — four spectrum zones against a reference curve built from commercial releases (animated bars with exact numbers) plus honest verdicts: "balanced" or "harshness detected".
• Track-long LUFS graph — the before/after loudness curve across the whole track with a target line.
• After the codec — we decode your MP3/AAC/OPUS back and show the real true peak of the encoded file. As far as we know, no other online mastering service does this.
• Streaming-Ready — and yes, if the track lands in the platform's corridor, there is a bit of confetti. You earned it.

A card for social media

The share button builds a PNG card: LUFS before/after, true peak, the loudness curve and the tonal verdict. Show your followers how your new track sounds — in numbers.

Feedback got easier

Both the web form and the Telegram bot (@magicmasterpro_user_bot, /feedback) now use preset buttons: dislike something — tap "Too quiet" or "Muddy"; like it — "Punch", "Clarity", "Great bass". Free text is optional. July's engine update literally started with one such dislike — your taps drive the roadmap.

Everything runs in the browser, no installs, on the free tier: magicmaster.pro/app — 1 mastering per UTC day after signing up.