GP Studio is a personal open source project: a desktop controller for the Valeton GP-5, the pedal that became a bestseller by packing a ridiculous amount of features for its price and size.
As a product, the GP-5 is nearly perfect. Its app is really good too, but it’s a phone app: you edit one module at a time. I play sitting at my computer and I need to see everything at once, so I built my own. Along the way I added the features I was missing and support for other pedals from the same brand.
The challenge was the hardware: mapping the controls through reverse engineering, fighting latency, and keeping the connection stable. Nothing like your everyday CRUD app.
It’s the most exciting project I’ve worked on in years. That’s why I gave it my nights for free, and why I opened it up so it can grow with its community.















