TABØR is a rhythmic analogue sound and CV source based on the unpredictability of four avalanche transistors in a continuous oscillation state.

These unpredictable core oscillators are related to each other and their charge and discharge cycle creates complex rhythmic sound textures that can be controlled and triggered with external CV inputs to add more contamination.
With this circuit we can obtain rhythmic textures- intended as rise pulses – and different tone heights by mixing the colors of the LEDs and the values of the capacitors. The waveform of a single oscillator, unfiltered, is basically a sawtooth. The result of the FM modulation of the whole sound engine is chaotic.


Four avalanche oscillators with two controls each:

  • F: regulates the distance between the spikes of the single sawtooth waves – their rise pulses frequency
  • M: the amount of cross-modulation of each core oscillator within the others

Each oscillator can act differently depending on the state of the others:

    OSC1: green light. The most percussive and predominant, the fundamental modulator.
  • 1F: ramp frequency control of oscillator 1
  • 1M: cross-modulation control of oscillator 1
  • OSC2: yellow light. Obedient to OSC1 rhythmically and its direct subsidiary – a carrier
  • 2F: ramp frequency control of oscillator 2
  • 2M: cross-modulation control of oscillator 2
  • OSC31: red light. Strictly related to OSC2 but can set-aside 1 as a modulator
  • 3F1 : ramp frequency control of oscillator 3
  • 3M1: cross-modulation control of oscillator 3
  • OSC4: orange ligths. Can act as a shutter to filter, or interrupt the whole communication
  • 4F: ramp frequency control of oscillator 4
  • 4M: cross-modulation control of oscillator 4
  • *these variables can all be controlled individually with vactrol CV inputs
    Visually you can see the “beating” oscillators in the hollow circle in the middle of the module.

The avalanche engine, to start oscillate and communicate, needs around 16v to 22v and any value below that point will stop hierarchically its operation:

  • RM: this input act as an attenuator to the oscillators, limiting their power supply 2

The result of the whole sound engine is given in three different outputs:

  • TR: blue ligths. A “squarified” always positive 0-7v trigger / cv source3
  • NM: the dry mixed audio signal straight out of the oscillators
  • ZZ: an auxiliary fuzz envelope output from the internal diode-based distortion circuit
    • 1 Due to its autonomy from the beat and to keep the communication balanced, OSC3 it’s missing the F and M control potentiometers. Its values can be changed only with external input CV inputs.
      2 A dummy cable will shut down the oscillators due to the inverted-vactrol configuration of this input. The RM input can be used as an internal voltage-controlled-attenuator, a VCA.
      3 This output is not always active, it fires triggers when the avalange engine reaches a certain threshold: blue LEDs blinking.

technical specs

  • 12 HP
  • 45 mm deep
  • 65 mA +12V
  • 7 mA -12V
  • 0 mA 5V

Black Orb panel

White Mirror panel

assembled units 290€ – exc. shipping
full-kits 190€ – exc. shipping

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[CC BY-NC-SA 4.0]


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