Kaleidophone
Turn light into sound.
Kaleidophone is a camera instrument for iPhone. Point it at light and it plays. What the lens sees becomes deep, dark sound that you shape with your surroundings: a lamp, a window, a flame, passing traffic.
It's inspired by optical sound instruments such as the Rare Waves OCM-2 Stereo Photophone.
What it does
Light and Motion
Play brightness and position, or switch to MOTION and play movement itself.
Ten voices
From Sub Quake and Deep Drone to Ornithopter, Descent and Corrode, each with its own colours.
Shape the lens
SIZE and SLIT turn the lens from a wide pool into a thin line.
Stereo
Two rings, one for each ear. Best on headphones.
Hold
Freeze a sound and let it play on, even with the screen locked.
Record and sync
24-bit / 48 kHz WAV recording, Ableton Link and MIDI.
How to play
Aim at light
Whatever falls inside the ring is what you hear. Darkness is silence.
Move
Move the phone or move the light. Brightness sets how loud it is; where the light sits in the ring shapes the voice.
Shape the lens
SIZE opens or narrows the ring, SLIT squeezes it into a thin line. Sweep it across a row of lights.
Choose a voice
The arrows step through ten voices, each with its own sound and its own colours.
Hold, record, share
Freeze a sound you love with HOLD, then record it as a WAV ready to drop into your DAW.
Controls
- VOICE
- The arrows step through the ten voices.
- NOTE
- Root pitch, C1 – C4. Everything stays low and heavy.
- BPM
- Tempo for the rhythmic voices (Sub Quake, Thunder, Sample & Hold), down to a slow 20. Follows Ableton Link when it's on.
- SIZE
- How much of the image is heard: a wide pool or a pinpoint.
- SLIT
- Squeezes the ring into a vertical line.
- LIGHT
- Plays brightness and its position.
- MOTION
- Plays movement instead. Passing traffic, a hand fan... The angle of the movement shapes the sound (sideways, up and down or diagonal), and more movement plays louder.
- STEREO
- Splits the lens into two rings, like two eyes. Light in the left ring pulls the sound into your left ear, light in the right ring into your right. Best on headphones.
- HOLD
- Freezes the sound. The lens is ignored and the sound keeps playing in the background and even with the screen locked. A sustain pedal does the same.
- TORCH
- Turns on the flashlight to light up objects close to the lens.
- MUTE
- Silences the sound, on the speaker and in headphones. Recordings still capture it.
- REC
- Records the sound as a 24-bit / 48 kHz WAV.
- RECORDINGS
- Everything you've recorded: play, trim, rename, share or delete.
- FAVOURITES
- Save a sound: voice, note, tempo, lens and mode. Bring it back with one tap.
- SYNC
- Ableton Link and MIDI.
The ten voices
- Sub Quake
- Sub-bass tremors that pulse with the tempo.
- Deep Drone
- A slow, tuned drone on a dark minor scale.
- Leviathan
- Three detuned saws through a ladder filter that the light opens.
- Thunder
- Rolling noise and low rumble, rising and falling every two beats.
- Static Field
- Resonant bands of noise, like charged air.
- Night Drive
- A warm analogue-style synth with vintage chorus.
- Ornithopter
- Beating wings. Faster in brighter light.
- Descent
- An endlessly falling Shepard tone. Light sets the speed of the fall.
- Sample & Hold
- Stereo filter steps that jump to a new place on every 16th.
- Corrode
- Crushed stereo noise that crackles harder in brighter light.
The halo
The halo around the lens is the sound itself. Every pitch has its own grains. Bass glows large and slow near the rim; higher sounds are finer, brighter sparks further out. Attacks flare, loud widens the halo, quiet lets it settle into a faint ring.
Record & share
- REC saves studio-quality WAV (24-bit / 48 kHz), captured even if MUTE is active, so you can record silently.
- When you stop, the share sheet opens. Everything is also kept in RECORDINGS, and in the Files app under On My iPhone → Kaleidophone.
- In RECORDINGS, drag the handles at either end of the waveform to trim, then tap SAVE TRIM to save a new copy.
Sync
ABLETON LINK
Play in time with Ableton Live and other Ableton Link-enabled apps on the same network. Turn it on in SYNC → ABLETON LINK: the pulse and the Sample & Hold steps lock to the shared beat, and tempo changes go both ways.
MIDI
Connect any keyboard or controller: USB, Bluetooth (SYNC → BLUETOOTH MIDI) or over Wi-Fi from a Mac. Notes set NOTE, the sustain pedal holds the sound, and program changes 1–10 pick the voice.
Tips
- Use headphones: the sub-bass and the stereo live there.
- Cover the lens to stop.
- Screens, LEDs and fluorescent tubes flicker. Each gives its own texture.
- A thin SLIT swept across a string of lights gives an organic tremolo.
- Find a sound, press HOLD, lock the phone and let it drone.
- In the dark, switch on TORCH and find fun things to use as sources.
- Add Kaleidophone to your Lock Screen or Control Centre (iOS 18 or later) to open it with one tap.
- While a held sound plays on the Lock Screen, play/pause mutes and unmutes it and the skip buttons change the voice.
Questions
What is Kaleidophone?
Kaleidophone is an iPhone app that turns the camera into a musical instrument. Brightness, position and movement inside the lens become low, textured drones and pulses.
Does Kaleidophone store or send my camera image?
No. The camera is used only as a light and motion sensor. Images are analysed live on the phone and are never stored or sent anywhere. Local network access is only used for Ableton Link and MIDI over Wi-Fi.
Does it work with Ableton Live and MIDI?
Yes. Ableton Link keeps the tempo in sync both ways. MIDI notes set the pitch, the sustain pedal holds the sound and program changes pick the voice.
Where can I get Kaleidophone?
Kaleidophone is on the App Store for iPhone. It's a one-time purchase, with no subscription and no in-app purchases.
Is this the same as Wheatstone's kaleidophone?
No. Charles Wheatstone's kaleidophone from 1827 made vibrations visible as patterns of light. Kaleidophone the app works the other way round: it turns light into sound.
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