Rosso
Hear your guitar pedal before you solder it.
Rosso launched on August 20, 2026 with 1 votes, #11,494 of 23,274 launches that month.
What it does
Draw a schematic and it makes sound on the spot. Lotus Engine, a circuit solver written in Rust, solves real circuits built from 1,920 real parts - from germanium fuzz to tube preamps. Free for Windows and macOS.
Draw a schematic and it makes sound on the spot. Lotus Engine, a circuit solver written in Rust, solves real circuits built from 1,921 real parts - from germanium fuzz to tube preamps. Free for Windows and macOS.
Rosso is a circuit simulator for building your own guitar effects pedals. Lay out resistors and transistors, wire them together, and it solves that circuit and turns it into sound. Before you commit to a board, you can hear what a single part change does. Pick from 1,921 real parts, drop them in and draw wires. Values can be changed later, freely. The circuit itself is solved and comes out as audio. The waveform and spectrum are shown at the same time, so you can check with your ears and your eyes at once. A wiring check runs continuously. Suggested improvements, grounded in measurement, can be applied to the circuit with a single button. Nothing past IN reaches GND. Add a resistor to set…from rosso.tsukubaonkyo.com
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