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.

A free Winamp clone, for macOS, with FLAC and Milkdrop visualizations

It might be a funny intersection of interests. But developer Matt Greenwood built a macOS-native clone of the legendary Winamp in Swift, MIT-licensed, with MP3 and FLAC playback and Milkdrop visualization support (including fullscreen).

Peter Kirn - November 14, 2025

Transform any binary file into sound and MIDI, right in your browser, free

01000011 01101111 01101111 01101100 00100001! Binary Synth runs in your browser, and translates any binary file from its zeros and ones into audio synthesis and MIDI messages. The code is available under an MIT license, too, if you want to play with it.

Peter Kirn - November 11, 2025

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