soundbox
A small studio for instruments made of wave equations. Compose strings, bars, membranes and a resonating body into a scene; the app writes the coupled PDEs as MATLAB, numbl compiles them to WebGPU compute shaders in your browser, and a microphone in the simulated air records what you then listen to. Play with a preset, build your own in the Build tab, or open the Lab to read (and edit) the equations and see the spectrum against where the partials should land.
the knobs a player would reach for
microphone
The measured spectrum of the recording (analyzed after Listen or Render clip), against each object's predicted partials: solid marks are the discrete scheme's own modes, dashed the continuous equations'. The gap between them is the numerical dispersion — on a coarse bar grid you can hear it.