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.

Bastl Instruments’ budget, handheld boxes are pure magic; new videos

Bastl Instruments’ transformation of the Kastle into the firmware-swappable Kastle 2 line is one of the best things in gear right now. The Wave Bard sample player firmware debuted just before Superbooth, winning over audiences at the packed show with patchable breakbeat mangling charm.

Peter Kirn - May 12, 2025

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