Real pedal circuits, played live in your browser.
Every circuit is solved from its actual schematic as you play. No guitar needed.
Input
A short walk through: cable, noise, level and tuning. Use headphones to avoid feedback.
Up to 60 seconds of your guitar, saved as a WAV file.
Cleanup and delay
Removes rumble and hiss. Run the noise check to remove hum too.
Delay
No guitar? Play one here. Chord pads, Auto strum and a fretboard sit just under the pedalboard.
Go to the digital guitar ↓A dry, unprocessed guitar track works best (WAV, MP3, FLAC).
Into pedals
How hard the guitar hits the pedals. 0 dB is typical.
Signal chain
Guitar → pedals → ampOutput
Starts quiet on purpose. Raise it slowly.
Peak limiter idle
More sound settings
Level match +0 dB
Audio format appears after power on
Starter boards
Boards for electric guitar. One click loads a finished sound. Then change anything.Pedal library
My own pedal designs and classic circuits, simulated part by part. Click Add to put one on the board.
New to effects? The kinds of pedals, and what the knobs mean
How it works
- Schematic in. Each pedal starts as an LTspice schematic.
More
The importer reads the
.ascfile, traces the wires into a netlist, and turns swept resistors into knobs. - Circuit solved. Every part is modelled and solved as you play.
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A modified nodal analysis engine models every resistor, capacitor, diode, transistor and op amp, and solves the nonlinear circuit with Newton iteration at up to eight times the audio rate, so distortion stays free of digital aliasing.
- Sound out. Your guitar goes through the circuit in real time.
More
The solver runs on the browser's real-time audio thread. Knobs change the actual pot resistances, and a speaker cabinet model stands in for the amp.
Chorus, flanger, delay and reverb are digital models, labeled as such: their analog versions depend on delay chips and springs that cannot be solved part by part in real time, so they copy the analog sound in software instead.
Want the numbers? The engine bench shows operating points, transfer curves and harmonic distortion for any circuit, including your own LTspice files.