Load your stems. Press one button. StemMaster analyzes every track, mixes and masters to industry standards — and explains every decision it made, while you watch the faders ride your mix in real time.
Most AI audio tools are a black box: song in, master out, shrug. StemMaster is the opposite. Amber marks show every decision the AI made. Cyan needles dance in real time as section automation and the vocal rider work your mix. And the Engine Notes panel writes it all down in plain English — what was done, to which stem, and why the measurements justified it.
Every tool below is evidence-gated: StemMaster measures your audio first and only applies what the measurements justify. No presets slapped on blind.
Balances, pans, EQs and compresses each stem by its measured role — kick vs bass masking resolved, mono support elements placed off-center, stereo prints left alone.
Detects your song's structure — verses, drops, breakdowns — and rides gain, pan, filters, reverb and stereo width per section. Muffled verses that explode into choruses.
A slow envelope follower pins your lead to the mix word-by-word — the fader ride an engineer does by hand, bounded and never pumping.
The kick ducks only the bass's low band. The vocal dips only the guitars' presence — and only while it sings. Surgical, modern, inaudible until you A/B it.
Transient shaping re-sharpens squashed drums; parallel (NY) compression blends density under thin kits without eating the hits.
Plate, room and hall characters — chosen per stem, sent only to elements that measure dry, never to the low end.
EQ, mid/side EQ, glue and multiband compression, saturation, stereo width, mono-bass fold below 120 Hz — vinyl-safe and mono-proof by construction.
Streaming −14 or Club −9 LUFS targets, 4× oversampled true-peak limiting, and a soft clipper that engages only at loud targets so club masters punch instead of pump.
StemMaster listens back to its own render, measures it against the target curve — or a reference track you drop in — and corrects itself before you ever hear it.
Drop in a commercial track: tonal balance, width and dynamics steer toward it while your loudness target is still hit exactly.
Twenty-two stems named “Audio Track 3 copy”? StemMaster fingerprints the audio and labels drums, bass, vocals and synths for you.
Type what you want — “dark and moody, heavy sub, vocals intimate” — and the AI interprets it into concrete engineering moves, then tells you how.
Drag in WAV, FLAC or MP3 stems — 4 or 40 of them. StemMaster labels them automatically and sets up your console.
Choose a profile (Rock/Live, Bass-Heavy, Vocal-Forward…), a loudness target, and optionally type a creative direction. Hit AI MIX & MASTER.
Flip A/B loudness-matched, read the Engine Notes, nudge any fader — then export 24-bit WAV, FLAC or MP3, hitting your target within a tenth of a dB.
StemMaster is a real desktop app, not a cloud service wearing one as a costume. All audio analysis and rendering happens locally, on your computer.
One purchase, yours forever. Free updates across the 1.x series.
Nothing phones home. No sign-in, no usage tracking, no analytics SDK buried in the installer.
Your stems and masters are processed entirely on your machine. Only compact measurement summaries are ever sent to an AI model — never audio.
Works out of the box with the built-in analysis engine — fully offline. Plug in your own API key (Anthropic, OpenAI, z.ai, and other compatible providers) to unlock the LLM engine. Your key lives in Windows Credential Manager, not a config file.