xaoc-devices-koszalin

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.

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