Citadel Alchemist

Imagine taking the wild, melodic heart of Bastl's Kastle 2 Alchemist and expanding it into a full Eurorack powerhouse— that's the magic here, a hybrid synth voice that punches way above its 16HP size with five distinct modes to spark endless ideas.

At its core, four oscillators drive hybrid synthesis across FILTER, FM (with feedback), SUPERSAW, HYPERSINE, and GLITCHNOISE modes, blending raw waveform mixing, ring mod, track-and-hold, and stereo noise for a massive timbral range. You've got hands-on controls for pitch (spanning ±3 octaves), timbre, envelope, and LFO frequency, plus attenuverters and patch points for CV/gate, note in, mod inputs, and even patchable envelope output. A synced LFO (triangle/pulse), tempo generator with tap and divider, and programmable pattern generator (edit rhythms via web app) keep things rhythmic, while stereo DC-coupled I/O, headphone out (up to 250 ohms), TRS MIDI, USB-C, and dual FX (delay plus chorus/flanger/distortion at 44kHz/16-bit) make it a complete system starter. Slim at 24mm deep, it fits anywhere and powers smaller rigs or slots into big ones seamlessly.

Early users are loving how it effortlessly generates catchy lines and harmonies from monophonic roots, praising the intuitive patching and FX wizardry—though some note the learning curve for deep pattern editing rewards experimentation.