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'Ivo' is a resonant low-pass VCF (Voltage Controlled Filter), switchable between 2-pole (12dB/octave) and 3-pole (18dB/octave) responses, with voltage control over feedback (resonance) as well as cutoff frequency. It will self-oscillate in 2-pole mode.

The module has two audio inputs, one with an attenuator, so it will also mix two signals at the filter input.

The module is 100% analogue, using discrete transistor OTAs.


Sound On Sound magazine (June 2022 issue - read the full review here) said

The 2‑pole setting, with its 12dB/octave ratio, is capable of some filthy, acidic filtering across a wide range, encouraging liberal use of the feedback (that is, resonance) parameter. The 3‑pole setting, meanwhile, which works at a steeper 18dB per octave, is gentle and warm, rendering the feedback parameter a somewhat classier tone‑shaping tool.

Waveform Magazine (issue #7 - read the full review here) said

Ivo is definitely excellent sounding and pretty clean. Which doesn’t mean it can’t scream, too; it howls with the best of them


Ivo's specifications are as follows:
  • Panel width: 8HP
  • Module depth: 37mm
  • Current draw: 22mA on the +12V rail, 18mA on the -12V rail
  • Inputs:
    • Cutoff (approximately 1V/octave)
    • Cutoff (with attenuator)
    • Feedback (with attenuator)
    • Audio input
    • Audio input (with attenuator)
  • Outputs:
    • Audio output

For more detail, please see the user manual.
Explore the Expert Sleepers analogue modules:

Pricing & Availablity

Ivo is available now.

MSRP: UK £159 (inc VAT), US $189 (exclusive of sales tax), EU €154.36 (exclusive of VAT)

For purchasing links, please see where to buy.

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