Rackears IconRackears.io
Citadel Alchemist - Image 1

Citadel Alchemist

EurorackHybridMonophonic

$309

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.

Released

2026

Status

In Production

Synthesizer
Format
Eurorack
Type
FM, Subtractive, Other
Internal Battery
No
Voice
A/D
Hybrid
Polyphony
Monophonic
Oscillators
4
Oscillator Type
-
Voices
1
Filter
Lowpass
Envelopes
1
LFO
1
Effects
Delay, Chorus/Flanger/Distortion
Expression
Aftertouch
No
Velocity
No
MPE
No
Additional
-
Software
-
I/O
Audio In
Stereo 3.5mm Eurorack-level
Audio Out
Stereo 3.5mm Eurorack-level
Headphone
Stereo 3.5mm
MIDI
In
MIDI Type
TRS (3.5mm)
Ports
USB-C, Clock In, Clock Out, Trigger In, CV/Gate
Wi-Fi
No
Workflow
Arpeggiator
No
Sequencer
Yes
Mod Matrix
No
Memory
No
Measurements
Dimensions
16 HP x 24 mm depth
Weight
-
Last updated Mar 7, 2026