LiveCaptureInteractiveThe DSP engine.
One small library of sound blocks: gate, EQ, limiter, cabinet and tuner.
Sound
A circuit model held to its reference.
Our sound models, compared against a circuit simulator.
MeasuredWhat it does
We publish how far apart the model and the circuit are, instead of asking you to trust the model.
Who it’s for
Anyone who wants an amp or pedal model they can believe.
Why we built it
Guitar effects are full of claims nobody checks.
What we’re proud of
On small signals the model stays within 0.031 dB of the simulator.
Try it
The live piece
From a circuit to a sound
Text version: Netlist to SPICE reference to biquad cascade, compared
Component values are read from the board's own netlist, simulated in SPICE, and converted to biquads by the bilinear transform. The plugin's response is compared against the SPICE reference rather than against taste, and the residual is published.
- the board's own netlist (not a hand-typed copy) leads to component values
- component values leads to SPICE AC reference
- component values leads to bilinear transform
- bilinear transform leads to biquads
- biquads leads to plugin
- SPICE AC reference leads to compare
- plugin leads to compare
- compare leads to residual, published 0.031 dB small-signal AC
- compare leads to left visible, not hidden (nonlinear half still hand-fitted)
Technologies used
What it’s built with.
- SPICE circuit simulationA circuit simulator we use as the reference: a sound model is only believable if it matches the real circuit.
- FaustA language for describing sound processing, which can be turned into plugins and into code that runs anywhere.
- C++The language of our sound engine and tuner, written once and built for a laptop, a Raspberry Pi and a microcontroller.
- MermaidDiagrams and charts described in text. We draw ours in 3D so you can turn them; the live pieces on these pages are built this way.
- WebGLHow a web page draws 3D on the graphics card. Our charts and diagrams use it, each with a text version.
- three.jsThe 3D library our charts and diagrams are drawn with.
Get in touch
Want something like this? Say hello.
A person reads every message.
Email [email protected]
Text us
Text us: +1 888-344-3607. You text first; we reply only in that conversation, about your question. No marketing. Msg & data rates may apply. Reply STOP to opt out, HELP for help. SMS program
Our goods: shop.squatch.ccThe studio: squatch.cc