Bastl’s Kastle 2 and Citadel Eurorack are now DIY kits, open source platforms

It started with Kastle 2, Bastl Instruments’ cute and clever handheld. It could be a multi-effect, a sample player, a synth. Then Citadel modules came along and did those things in Eurorack. Now, Bastl’s got a surprise: you can buy these as DIY kits, and a big chunk of the Raspberry Pi-powered platforms are being released as open source. Here are all the details.

NAP, free visual and media framework, now dazzles anywhere

With deeper support for Linux and high-DPI rendering, NAP, the expressive, low-latency, efficient framework for control and visuals, can now awe audiences anywhere. Visualization, sound, running electronics, whatever it is you want to throw at NAP, now you can do it better on Windows and Linux, including embedded platforms. And did we mention it’s free and open source?

Peter Kirn - October 23, 2025

A drum machine as a stick figure navigating a colored, pixellated grid with three rows.

10,000 Drum Machines is full of wild, weird, free Web music devices

Forget what you know about drum machines. You’re about to open up a browser tab and listen to a drum machine made with a bouncing DVD logo, or a game of Minesweeper, or seismic data, De Bruijn sequences, or pics of cats and boots. Okay, it’s fairly short of 10k — they’re at 48 so far — but if this is your first time, you’d better plan on not getting any more work done today anyway.

Peter Kirn - September 22, 2025

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