Super Time Ultra
Play harmony in the air.
Play harmony, lead, and rhythm with hand gestures in a private camera instrument. Start the camera and begin shaping sound with your hands.
MOTION is a private camera instrument for shaping harmony, lead, and rhythm with your hands. Start the camera, bring your hands into view, and begin playing.
What this tool includes
Free online gesture synth
Turn a webcam into a playable music instrument with no download, no account, and local hand tracking.
Harmony setup
Choose a progression in any key, then change the root and quality of every gesture slot.
Easy or expressive
Use five simple shapes, or add OK and horns for a seven-chord palette.
Online theremin-like melody
Point one finger and gently raise or lower through a scale with a smooth, forgiving glide.
Fast hand tracking
One 21-point hand model gets the full camera-frame budget for quick, stable chord changes.
3D palm colour
Face the camera for major, then turn through maj7, 7, m7, and minor.
Air Dock
Point with either hand to switch the arpeggiator or beat, or hold a bar-end fill.
Beat triggers
Start or stop the groove from Play beat in the hero, live stage, or Sound settings, press B, or point at Beat in Air Dock.
Filter motion
Open and close for cutoff, use height for resonance, or choose height or palm turn for cutoff.
Beat-locked changes
Keep confirmed chord changes on the shared audio clock while a groove runs, or switch to Instant response.
Beat challenge
Follow a four-step I–V–IV–V target against the shared groove and get local feedback from your hand gestures.
Beats and polyrhythms
Add a metronome, drum groove, 3:2, or 4:3 pattern.
Sound mix
Choose the synth tone, set explicit synth and drum levels, and spread your hands for space.
Arpeggiator
Set the rate, octave range, portamento, and shared BPM.
Duo Jam
One person plays harmony while a second triggers beat-synced kick, hat, snare, ride, tom, and fills.
Cover Studio
Capture the camera, vocal microphone, chord synth, live overlays, and optional local backing track together.
Review and download
Watch the finished take immediately, retake it if needed, or save the local video file.
How to use this tool
- Choose a progression and key, or customize the chords assigned to each gesture slot.
- Select Easy mode for five shapes or Expressive mode for seven shapes.
- Start Beat Challenge to follow the visible I–V–IV–V target against the shared groove.
- Name the song and select portrait or landscape video.
- Optionally add a local backing track and choose a short count-in.
- Press Record, then allow camera and microphone access when the browser asks.
- Use Chords for latching harmony, or choose Air Melody to point and glide through a scale. The second hand can shape the tone.
- Stop the take to open an immediate video review with the chord and filter overlays included.
- Retake the performance or download the finished file before refreshing the page.
Practice tips
- Keep both hands clearly inside the frame with even light behind the camera.
- Hold a new shape clearly for a moment; uncertain frames keep the last stable chord sounding.
- Use headphones for a cleaner vocal recording without speaker spill.
- A local backing track stays on your device; choose audio you have permission to use.
Quick answers
How does MOTION work?
In Harmony, show a relaxed shape to latch a chord. In Lead, one hand holds the chord bed while the other raises or lowers through the scale. The compact stage dock keeps Beat, Record, and deeper controls close without crowding the performance.
What is Air Melody?
Air Melody is a two-hand, theremin-like surface: one hand holds a chord bed while the pointing hand raises or lowers to choose scale notes. A fist releases the lead.
Can I choose every chord?
Yes. Pick a diatonic progression or edit all five or seven gesture slots.
Can my palm add seventh chords?
Yes. Turn on 3D Palm Colour, then face the camera for major and turn through maj7, 7, m7, and minor.
How are finger counts kept stable?
All 21 landmarks, both finger joints, and adjacent frames confirm a change. Unclear frames keep the last proven chord sounding.
Can it play drums and polyrhythms?
Yes. Choose a beat, metronome, 3:2, or 4:3 pattern, then set tempo, drum level, and reverb.
Where are the beat controls?
Use Play beat in the hero, the live stage, or Sound settings, press B, or point at Beat in Air Dock while Chords mode is running. Fill is held while a groove plays.
Can chord changes stay in time with the beat?
Yes. Beat lock queues the next confirmed chord shape to the next beat while a groove runs. Turn it off for instant response.
Can I practice chord changes against a beat?
Yes. Start Beat Challenge to follow a four-step I–V–IV–V target against the shared groove and get local feedback from your hand gestures.
Can I change the synth sound?
Yes. Choose Warm, Glass, Pulse, or Organ, then add an arpeggiator with tempo, octave range, and portamento.
Why does it track hands only?
One 21-point hand model gets the full camera-frame budget, keeping chord changes quick and stable.
Can two people play together?
Yes. Duo Jam gives one person chords and filter while the second uses beat-synced shapes for kick, hat, snare, ride, tom, and fills.
Can I record a cover song online?
Yes. Cover Studio combines camera, microphone, chords, beat, overlays, and an optional local backing track into one downloadable video.
Does my camera get uploaded?
No. Play mode records nothing, and hand tracking runs on your device. Cover Studio starts only when you press Record, and a take is uploaded only if you publish a link.
Do I need a camera?
Yes. MOTION is built around live hand tracking. Video is processed on your device and is uploaded only if you publish a take.
Is MOTION a free online gesture synth?
Yes. MOTION runs in the browser with no download, and camera tracking stays local to your device.