Super Time Ultra
Free online gesture synth with Air Melody
Play chords and a theremin-like Air Melody with your hands in a free browser instrument. Use a webcam or touch ribbon, stay in key, add beats, and record a local jam.
Play chords, melodies, beats, and synth with simple hand movements in a free browser instrument. Use a webcam or touch controls, then share a local jam.
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 move horizontally 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 the filter hand to switch the arpeggiator or beat, or hold a bar-end fill.
Filter motion
Open and close for cutoff, use height for resonance, or choose height or palm turn for cutoff.
Beats and polyrhythms
Add a metronome, drum groove, 3:2, or 4:3 pattern.
Sound mix
Choose the synth tone, move closer for volume, spread your hands for space, then mix synth and drums.
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.
- 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 Hand Jam work?
In Chords, show a relaxed shape to latch a chord. In Air Melody, point one finger and move left or right through the scale. Your other hand can shape the shared tone.
What is Air Melody?
Air Melody is a one-hand, theremin-like surface: horizontal movement chooses a note, the default scale keeps every note musical, and 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.
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. Cover Studio starts only when you press Record and keeps the take in this browser session.
Can I play without a webcam?
Yes. Chord pads, the Air Melody touch ribbon, and number or arrow keys use the same saved harmony and sound settings.
Is Hand Jam a free online gesture synth?
Yes. Hand Jam runs in the browser with no download. Camera tracking stays local to the browser, and touch controls are available when a camera is unavailable.