D KURD HANDPAN POLAR
MIDI OUT—
0
MIDI SETUP
100
Click over MIDI
The metronome goes to the machine, not the phone. Pick a channel whose track holds something click-shaped; the downbeat plays four notes higher.
10
37
—
No layers yet — arm ● and play a pass
Octave 0
VOICE
EDIT PATCH
Envelope
Filter
Movement
 
SONGS
Saved
 
TIRE EFFECT
One tire, two values. Point it at the reverb or at the delay; the other keeps its setting. The delay follows the tempo and touches only what your hands play, never the loop.
KEY
SCALE
KIT BALANCE
Trim each drum so the kit sits level. Not a live control — set it once.
—

100BPM

KontrollRad

v1.27.0  ·  InvisibleChaos

A wheel you play. The hub is the root note, the eight spoke-bound sectors are the scale above it, and every part of the wheel does one job.

It carries an instrument of its own — the RadPan — and it can put the same gestures out over MIDI to drive other gear.

InvisibleChaos
KontrollRad · v1.27.0 · kontrollrad.netlify.app
Where it comes from
ic-kitchen.netlify.app · the kitchen it was built in
Built
One HTML file. Web Audio and Web MIDI, no libraries, no build step, no analytics, no account, no server.
Patches and songs you make are saved in this browser and nowhere else. A share code carries a whole patch, so sending one needs nothing of ours in between.
Install it and it works with no network at all — the whole instrument is five files, and they are kept on the device.
Every sound is synthesised live — there are no samples in here.
The RadPan, its built-in voice, grew out of the Klangfeld synth engine.
Playing it
MIDI needs Web MIDI, so Android rather than iOS. Bluetooth audio adds its own delay: wired or speaker for percussive play, pads and drones over BT.
Gear
SEQTRAK is a trademark of Yamaha Corporation. Woovebox is a trademark of SiliconFields, a product of Pocket Animal Audio Pty. Ltd. Neither company is affiliated with this instrument or has endorsed it; the patches were written from their published MIDI documentation.
© 2026 InvisibleChaos · Impressum
01 · Play

Tap a sector

Each wedge between the spokes is one note of the scale. The hub in the middle is the root.

Sweep across the spokes for a run.

02 · Play

Hold to sustain

Keep a finger down and the note latches and rings on instead of fading.

Flute, pad and bass stop when you let go. Handpan and piano ring on. The kit is one hit per tap: hub is the kick, the sectors are the rest.

03 · Shape

Slide while holding

Away from the hub opens the filter. Around the arc adds resonance.

Every finger shapes its own note, independently. The drawing shows POLAR; tap that rim label for XY, where the same two controls follow the screen — up and down, left and right — instead of the wheel.

04 · Shape

The tire is the effect send

Turn the rubber to set how much reverb everything sits in. It turns without moving the notes. FX, top left, picks the reverb, and can arm a tempo-locked delay that touches only what you are playing, never the loop underneath.

The short arc on the left of the tire is vibrato depth.

05 · Set up

Drag the valve stem

The small brass stub on the rim turns the note ring. Put the low notes where your hand wants them.

Set once for a piece, then leave it.

06 · Set up

Tap the rim labels

Instrument, scale, key, and whether the slide axes follow the wheel (POLAR) or the screen (XY).

Tap anywhere on the tire behind a label, not just the letters.

07 · MIDI

Or drive real gear

The same wheel, sending MIDI instead of playing the RadPan. Sectors send notes, the slide sends cutoff and resonance, the tire sends whatever you map it to.

Patches for SEQTRAK and Woovebox. The Woovebox needs nothing extra; a SEQTRAK needs a BLE-MIDI dongle. Android only. FX shows what each gesture sends to the machine; any of them can be set to nothing.

08 · Make

Build your own sound

Tap the instrument label on the rim, then Make a sound of your own. Three oscillators, an envelope, a filter and one moving part — enough to get a long way from the factory sounds.

The drawing shows the wave change as you move a slider. Saved patches sit on the wheel beside the instruments and stay in this browser. Copy code turns a patch into text you can send to anyone. Hold a patch in the list to edit it.

09 · Keep

Save a loop, or take it with you

SONGS saves the loop you have built — every layer, its faders, tempo and grid — so a piece survives the session.

MIDI file writes a real .mid with one track per layer, ready for a DAW or a groovebox. Tag it RADPAN, WOOVEBOX or SEQTRAK and the channels are laid out the way that machine expects them.