Rosso
Hear your guitar pedal before you solder it.
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.
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 1,920 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
Does the same job
all alternatives →- IVI've built a tool for musicians using modular gear2022 · patcher.xyz · ▲53
Hello HN, not many will know what this tool is about, but it's launch day and I always dreamed of posting on HN. Let's start! This is a tool for people using eurorack gear. For synth people. What is cool about my tool is that I show the signal flow with a graph. Here's the official press text: After a decade of stagnation in this space we are excited to present patcher.xyz: the modern way to manage everything modular. It’s a tool for professionals, enthusiasts, and casual wigglers. Novadays artists must develop their own means of taking notes, often on paper, since there is no common format…
- IMI made a little digital circuit simulator that operates on PNGs2022 · github.com · ▲259
This is a little toy project of mine that lets you simulate digital logic graphs. It was inspired by Minecraft's Redstone and the Piet esolang. It's got some serious drawbacks-- you write circuits as PNGs and simulate them with a Python interface. It's slow to run and slow to experiment with. And it is certainly difficult to use for people with any kind of color blindness. But despite that, I hope this can still be a fun toy!
More dev tools this month
the category →
Open-source GTM skills for technical founders
Dev tools · 29d ago · gtmcofounder.com
OpenTrailPaper is open-source bike computer firmware for the LilyGO T5S3 4.7" E-Paper PRO. It supports offline maps, GPX routes, FIT recording and Bluetooth sensors.
Dev tools · 1d ago · opentrailpaper.com
Launched alongside, August 2026
the whole month →- TL
Life & fun · 10d ago · louisabraham.github.io
- SA
Hello HN! I found that picking out plausible but diverse skin tones for my digital art and game development projects was kind of difficult, and I got curious about if there was a way to define a color space that made it easy. I've built a color picker and procedural generation algorithm based on the space as well as a bunch of other fun js features and demos throughout the page that use the equations. If you find it interesting, I have lots of explanations of how I built it and what properties the space has. The methodology might be a bit shaky, but hopefully the result is as helpful for…
Life & fun · Aug 2026 · toneyalexander.github.io
I trained a 125M-parameter transformer to autocomplete piano performances in real time (~108 notes/sec on an iPhone 15). The idea is basically GitHub Copilot or Tabnine, except instead of prompting it with code, you prompt it by playing a few notes on a MIDI piano. The model then continues what you played, entirely on-device. The app is free if anyone wants to try it. Happy to answer questions about the model, training, Core ML, or the many things that didn't work.
AI · 16d ago · simedw.com