The key, in your key
Choose your instrument once. Maestro transposes every track, so an alto player reads C♯ minor while the DJ plays E minor. It updates the moment the DJ mixes into the next track.
Works with djay Pro
Live key, beat and cues
from DJ to musician.
Maestro gives the sax, violin or trumpet player beside the DJ their own live view of the set: the key transposed for their instrument, the beat, and a cue light that tells them when to come in.
ADE Lab Hackathon 2026:3-minute pitch →Hackathon criteria →
In the DJ booth · djay Pro
MAESTRO/CUE
Click or press Space to send the next cue
SEND TO
127.0.0.1 : 9000On stage · Musician
MAESTRO/MUSICIAN
CUE
Stop
AUDIO
Deck 1 · Heart Like Mine
Sam Feldt
1:02 / 3:02Playing
MUSIC
KEY
C♯ minor
BPM
124
Concert E minor → you read C♯ minor
Simulated set. Maestro follows the deck you're mixing into and sends cues on the drop.
Without Maestro
Playing by ear, watching for a nod.
The DJ mixes into a new key, the tempo shifts, the drop lands two bars early. The musician guesses, and the crowd hears it.
With Maestro
Know the key. Know the cue.
The key, the beat and what's coming next sit on a phone or iPad at the musician's feet, and the DJ cues them in with one tap.
How it works
From the booth to the stage in a fraction of a beat.
-
djay Pro shares the set
djay Pro streams what's playing over OSC: track, key, tempo and position. Maestro listens and follows the deck you mix into.
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The DJ cues with one tap
The Maestro Cue plugin sits in djay's effects. Step the light through Stop, Ready and Play. Audio passes through untouched.
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The musician scans and plays
Scan the QR code in the plugin and Maestro opens on the musician's phone or iPad. Add it to the home screen and it runs like an app.
Features
Everything a live player needs. Nothing they don't.
Stop · Ready · Play
A three-state cue light from the DJ. Ready shows what's coming next, so nobody is caught off guard.
Live waveform
A scrolling waveform straight from the DJ's audio. See the build coming and feel where the drop lands.
Tempo, bar and beat
Live BPM and a four-beat counter, locked to djay, so you always know where "one" is.
Next-track preview
See what's loaded on the other deck, with its key and tempo, before the mix begins.
Traffic light mode
Turn the whole screen into the cue colour. Readable from across a dark stage, even out of the corner of your eye.
Phone, iPad or laptop
No app store, no account. Maestro runs in the browser and installs to the home screen in two taps.
Local and private
Everything stays on the venue's Wi-Fi. No cloud, no sign-in, nothing recorded.
Built for dark stages
Dark mode by default, a light mode for daylight sets, and high-contrast cues that always say what they mean.
For musicians
Play with confidence, not guesswork.
- Your written key for every track, transposed for your instrument
- A clear signal when to come in, and when to lay out
- See the build coming and land on the drop
- Works on the phone already in your pocket
For DJs
Lead the stage without leaving the decks.
- Cue your musician from djay with one tap, or Space
- No hand signals, no shouting over the system
- Mix freely: Maestro follows the crossfader
- Audio passes straight through the plugin, untouched
Pricing
Free for musicians. Simple for DJs.
Musician
Free
The companion app, always free.
- Live key, tempo and beat
- Cue light and traffic light mode
- Phone, iPad and laptop
Most popular
Duo
$29one-time
The Maestro Cue plugin for djay Pro.
- Stop / Ready / Play cues
- Live waveform for the musician
- QR join and next-track preview
- Free updates
Residency
$79one-time
For venues and touring acts.
- Everything in Duo
- Up to five Macs
- Multiple musicians on one set
- Priority support
FAQ
Questions, answered.
What do I need?
djay Pro with OSC support on a Mac, and a phone, iPad or laptop with a browser for the musician. Both devices join the same Wi-Fi network.
Does the plugin change the DJ's sound?
No. Maestro Cue passes the audio through unchanged. It only reads the signal to draw the musician's waveform and sends cues on the side.
Which instruments are supported?
Any instrument in C, B♭, E♭ or F: violin, flute, piano, trumpet, clarinet, tenor and soprano sax, alto and baritone sax, French horn and more.
How fast are the cues?
Cues travel over the local network and appear on stage almost instantly, well inside a beat.
Do I need internet at the venue?
No. Maestro runs entirely on the local network. Nothing goes to the cloud.
What if the signal drops?
If the musician's screen stops hearing from the booth, the cue falls back to Stop, so nobody plays on a stale signal.