expert-sleepers-ivo

Expert Sleepers Ivo

Discrete OTA low-pass VCF with 2/3-pole switching

8 HP Eurorack module

Ivo is a 100% analogue resonant low-pass VCF using discrete transistor OTAs. Switchable between 2-pole (12dB/oct) and 3-pole (18dB/oct) responses with voltage control over both cutoff frequency and feedback (resonance). Self-oscillates in 2-pole mode. Features two summed audio inputs (one with attenuator) for built-in signal mixing at the filter input. Illuminated I/O jacks glow red for positive voltage, blue for negative, purple for audio.

Features

  • 100% analogue signal path using discrete transistor OTAs
  • Switchable 2-pole (12dB/oct) and 3-pole (18dB/oct) low-pass responses
  • Self-oscillation in 2-pole mode for use as sine oscillator
  • Approximately 1V/oct cutoff tracking (adjustable via internal trim pot)
  • Voltage control over both cutoff frequency and feedback/resonance
  • Two summed audio inputs with built-in mixing
  • Three attenuators: Cutoff CV 2, Feedback CV, and Input 2 Level
  • Illuminated I/O jacks show signal polarity (red=positive, blue=negative, purple=audio)
  • 22mA +12V, 18mA -12V power draw
  • 8HP, 37mm deep

Controls & Jacks (12)

  • Cutoff
  • Cutoff CV 2 Attenuator
  • Feedback
  • Feedback CV Attenuator
  • Input 2 Level
  • Cutoff CV In
  • Cutoff CV 2 In
  • Feedback CV In
  • Input 1
  • Input 2
  • Output
  • Poles

How-To Guides

  • Acid Bass Line
  • Dual Source Filtering
  • Warm Pad Filter
  • Pure Sine Generator

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

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