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

Bastl Instruments Crust drum voice is free in VCV Rack, too

The free modules for VCV Rack are coming fast and furious. The latest is Bastl’s awesomely versatile Crust drum voice. Just in case you need something to, you know, distract yourself today/tonight/the rest of this week.

Peter Kirn - November 5, 2024

Bastl’s new Neo Trinity module: 6-channel modulation with recording

Peter Kirn - January 29, 2024

Bastl – Casper Aikido module is a mixer and a quad VCA and a compressor envelope follower

Peter Kirn - February 8, 2023

Bastl adds extra toppings to Pizza wave-shaping, FM oscillator

Peter Kirn - November 18, 2022

BASTL Microgranny is back – in a limited Monolith edition with Bogdan Raczynski

Peter Kirn - October 14, 2022

Erica LXR-02 drum machine update: finally, autosave, plus new Hrtl kits

Peter Kirn - August 31, 2022

Bastl’s delicious Pizza: waveshaping meets FM for a tasty modular oscillator

Peter Kirn - May 11, 2022

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