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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.

Open Steinberg: VST3 and ASIO SDKs now have open source licenses

Open licensing for proprietary audio and plug-in standards could enable the entire industry to move forward on some critical work. So it’s great news that Steinberg this month announced not one but two big licensing announcements: first, a dual-licensing model for their ASIO audio driver protocol for Windows (including an OBS collaboration), and now a permissive MIT license for the mighty VST3 plug-in spec.

Peter Kirn - October 29, 2025

Motion Music tech Software Tech

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Mix and patch ChowDSP’s tape modeling for free in VCV Rack

No collection of DSP models for work, pleasure, and creative abuse would be complete without the Chowdbury DSP collection. You might know about the plug-in, but it’s also worth noting that these are available in VCV Rack and Cardinal, where you can patch them at will.