instruo-ochd-expander

Instruo øchd expander

function (maths) 8+4^2 = more modulation

4 HP Eurorack module

The ochd expander adds 16 derived modulation outputs to ochd: rectified LFOs, analogue diode logic, cascaded triggers, and stepped random-voltage sources.

Features

  • 16 additional outputs for ochd
  • Four full-wave-rectified unipolar LFO outputs
  • Two analogue diode logic pairs providing AND/minimum and OR/maximum outputs
  • Four cascading stochastic trigger outputs
  • Four R-2R 4-bit random-voltage slow-noise outputs

Controls & Jacks (16)

  • Even LFO DAC Output— R-2R DAC stepped random voltage derived from even-numbered LFOs 2, 4, 6, and 8, with LFO 2 as MSB.
  • LFO 6/7 OR Output— Maximum-voltage (OR) diode logic of LFOs 6 and 7 (±5 V).
  • LFO 4 Trigger Output— Approximately 8 ms trigger from LFO 4, with unpatched LFO 2 triggers cascaded into this output.
  • LFO 1 Full-Wave Rectifier Output— Full-wave-rectified LFO 1: a unipolar positive triangle at twice LFO 1's frequency (0–5 V).
  • LFO 7 Full-Wave Rectifier Output— Full-wave-rectified LFO 7: a unipolar positive triangle at twice LFO 7's frequency (0–5 V).
  • LFO 6/7 AND Output— Minimum-voltage (AND) diode logic of LFOs 6 and 7 (±5 V).
  • LFO 5–8 DAC Output— R-2R DAC stepped random voltage derived from LFOs 5–8, with LFO 5 as MSB and LFO 8 as LSB.
  • LFO 2/3 AND Output— Minimum-voltage (AND) diode logic of LFOs 2 and 3 (±5 V).
  • Odd LFO DAC Output— R-2R DAC stepped random voltage derived from odd-numbered LFOs 1, 3, 5, and 7, with LFO 1 as MSB.
  • LFO 8 Trigger Output— Approximately 8 ms trigger from LFO 8; unpatched trigger sockets cascade clockwise from top left to top right to bottom right to bottom left
  • LFO 3 Full-Wave Rectifier Output— Full-wave-rectified LFO 3: a unipolar positive triangle at twice LFO 3's frequency (0–5 V).
  • LFO 2/3 OR Output— Maximum-voltage (OR) diode logic of LFOs 2 and 3 (±5 V).
  • LFO 6 Trigger Output— Approximately 8 ms trigger from LFO 6; unpatched trigger sockets cascade clockwise from top left to top right to bottom right to bottom left
  • LFO 5 Full-Wave Rectifier Output— Full-wave-rectified LFO 5: a unipolar positive triangle at twice LFO 5's frequency (0–5 V).
  • LFO 2 Trigger Output— Approximately 8 ms trigger at each rising edge of LFO 2; normalled clockwise to the next trigger output when unpatched.
  • LFO 1–4 DAC Output— R-2R DAC stepped random voltage derived from LFOs 1–4, with LFO 1 as MSB and LFO 4 as LSB.

Explore the interactive øchd expander panel on BleepDex — tap any control to learn what it does.

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