Bastl Instruments Citadel Alchemist - Synth Module

• experimental synth voice
• all functions patchable
• 5 synth modes (Filter, FM, Supersaw, Hypersine, Glitchnoise)
• Hybrid synthesis (4 VCOs, Feedback FM, Raw Waveform, RingMod, Track & Hold, Noise + T&H, Stereo Filter, Transient Shaper)
• Effects: Delay or chorus/flanger/distortion
• Macro envelope with CV output
• Stereo audio processing 16 bit / 44kHz
• Pitch range +/- 3 octaves
• Quantizer with definable scales (editable via web app)
• CV/gate pattern generator (editable via web app)
• Tempo generator (becomes a Clock divider with external clock)
• LFO with triangle & square waveform (sync / reset / free)
  
• MIDI In
• Clock In & Out
• Stereo inputs & outputs
• Headphone output
• USB-C on the back (editing, USB MIDI, firmware loading)
• Reversible front panel & interchangeable OS
  

The Bastl Instruments Citadel Alchemist is the Eurorack version of the experimental, patchable synthesizer. Unlike the original with thin pin connectors, this module offers 24 inputs and outputs for audio, CV, gate, clock, and MIDI. At first glance, it provides all the typical synthesizer parameters expected from a full-featured device. The digital sound engine offers five synth modes: Filter, FM, Supersaw, Hypersine, and Glitchnoise. Special features include 4 VCOs, Feedback FM, Raw Waveform, RingMod, Track & Hold, Noise + T&H, Stereo Filter, and Transient Shaper. The oscillator has a pitch range of ±3 octaves, and the integrated quantizer allows definable scales, editable via the web app. Internal modulation options include a macro envelope, a synchronizable LFO with two waveforms, and a CV/gate pattern generator, which is also editable through the free web app. The effects section further shapes the sound: turning the TIMBRE Mod control fully left produces a delay, while turning it from center to right provides a smooth transition from chorus to flanger to distortion. The Citadel Alchemist delivers a wide sonic spectrum, from classic analog tones and FM-like sounds to waveshaper effects and atonal textures. The module features a reversible front panel, with “Alchemist” on one side and a blank label on the other; a tool for panel reversal is included. Current and future firmware updates can be loaded and tested via the USB port.