XAOC Devices Koszalin
Stereo frequency shifter with feedback spectacle
10 HP Eurorack module
Koszalin is a stereo frequency shifter that translates the entire frequency spectrum by a fixed amount in Hz, creating atonal and inharmonic textures. With voltage-controlled feedback routing and through-zero linear FM, it produces spectacular barber-pole effects and comb filtering responses that move through time and frequency.
Features
- Stereo frequency shifting with 2 inputs and 4 outputs
- Three frequency ranges: 50Hz, 500Hz, and 5kHz
- Independent exponential and linear through-zero FM inputs
- Voltage-controlled internal feedback with routing options
- Density parameter for feedback character control
- Digital DSP with analog interface
- Input level indicator with color coding
Controls & Jacks (15)
- Shift — Sets amount of frequency shifting applied to input signal in Hz, with exponential response around 0Hz
- Regen CV In — Controls feedback amount
- Lin TZ FM Atten — Linear through-zero FM attenuator knob
- Lin TZ FM — Linear through-zero FM input
- Up Shifted Out — Output carrying the signal with frequencies shifted upward by the set shift amount
- Up Shifted Out R — Up shifted output - right channel
- Input — Main audio input for the frequency shifter
- Density — Density control knob for feedback character
- Up Shifted Out L — Up shifted output - left channel
- Exp FM — Exponential FM input
- EXP FM — Exponential frequency modulation input (±5V)
- Down Shifted Out — Output carrying the signal with frequencies shifted downward by the set shift amount
- LN TZ FM — Linear through-zero frequency modulation input for modulating the shift frequency
- Regen — Controls feedback amount
- Input LED — LED indicating signal presence at the audio input
How-To Guides
- Through-Zero FM Operator
- Barber-Pole Filter Effect
- Harmonic Downshift Texture
- Deep Resonant Flanger
- Spectral Cascade Effect
- Ring Mod vs Frequency Shift
- Negative Frequency Exploration
- Stereo Feedback Routing
Explore the interactive Koszalin panel on BleepDex — tap any control to learn what it does.
