Meet REX,
your AI mixing engineer.
REX is an AI mixing and mastering engineer who lives in your browser. Drop your audio, tell him what you're going for, and he handles the whole mix: EQ, compression, dynamics, reverb, stereo image, and loudness — all calibrated to your genre.
No DAW. No plugins. No install. Just audio in, professional mix out.
🎚️
What are stems?
Stems are the individual tracks of a song — each instrument or group exported as its own file from your DAW. REX gets a much better mix when he can work with each element separately.
Drums
Bass
Vocals
Keys
Pads
Don't have stems? Use Single Track mode — just drop in your full mix or rough bounce and REX will work with that instead.
⚡
How it works
1
Drop your stems (or a single track) and pick your genre
2
Tell REX what you're going for in the Mix Brief or just chat with him
3
REX analyzes the audio and applies a full professional mix — EQ, compression, dynamics, width, reverb
4
Preview, tweak with faders, or send REX back in with revision notes — then download
🔑
You'll need an API key
You're in. As a FADE PUSH beta tester, REX is fully activated and ready — no setup required. Just drop your audio and let him work.
Beta access is completely free — no credit card, no account needed
Drop your track, tell REX how you want it to sound, and he handles the rest
Your feedback shapes the final product — we want to hear everything
Your key is stored locally in your browser only and never shared with anyone.
🎶
Ready to mix?
REX is standing by. Drop your stems, pick your genre, give him a brief — and let him work.
Hit ? in the top bar any time to revisit this guide.
REX'S MIX
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WAVEFORM · CLICK OR DRAG TO SCRUB
0:00 / 0:00
EQ CURVE
SETTINGS APPLIED
COMPARE: REX'S MIX vs REFERENCE
REX'S MIX
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0:00 / 0:00
EQ CURVE APPLIED BY REX
REFERENCE TRACK
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0:00 / 0:00
ORIGINAL · UNPROCESSED
Reference track REX calibrated your mix to match.
REFERENCE TRACK FREQUENCY PROFILE
◉
DROP YOUR TRACK
MP3 · WAV · FLAC · AAC
INPUT LEVELS
PEAK L
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PEAK R
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RMS
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HOW ARE WE MIXING TODAY?
🎵  SINGLE TRACK
Got a full song or rough bounce? REX enhances the whole track — EQ, compression, stereo width, loudness target. Ready in seconds.
🎚️  STEMS SESSION
Drop your individual tracks — kick, bass, vocals, keys, pads. REX builds the full mix from scratch, stem by stem.
01DROP YOUR AUDIO — any format. No DAW required, no install, no plugins.
02PICK YOUR GENRE — REX knows what every genre should sound like at a professional level.
03BRIEF REX — describe the sound you want in plain English. He reads it, he delivers it.
04DOWNLOAD YOUR MIX — WAV or MP3, mixed and mastered, ready for distribution.
REX
· MIXING ENGINEER
Ready — load a track or stems to begin
Select a mode and drop your audio. REX handles everything from there.
REX // MIXING ENGINEER
What's good. Drop whatever you've got — a full track, rough mix, or a whole session of stems. While you're doing that, talk to me: what's the vibe, what genre are we in, who are you trying to sound like? The more you give me upfront, the sharper the mix. No forms, no technical jargon — just tell me about the track and what you're going for. That's your brief. EQ, compression, dynamics, stereo image, loudness — I've got all of that. You just bring the vision. Let's hear it.
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WAVEFORM · CLICK OR DRAG TO SCRUB
0:00 / 0:00
AUDIO STATS
PROCESSING APPLIED BY REX