Instruo - I-ō47


I-ō47 Multimode Resonator/Filter is a modern take on a vintage circuit design inspired by the classic 1047 module of the ARP2500. It has been designed with some extra features like an additional inverted input and a strike input for pinging the filter. It offers four different slope outputs: lowpass, highpass, bandpass and variable notch output. The internal VCA’s are a new hybrid design of matched transistors and precision op-amps. With CV controllable centre frequency, resonance/Q and notch offset along side FM the I-ō47 is truly a filter for all occasions.




  • Centre frequency range 16Hz to 16KHz
  • 1V/octave, Coarse and Fine frequency controls
  • FM input with attenuverter
  • Low pass 12 dB/octave
  • High pass 12 dB/octave
  • Band pass 6 – 12 dB/octave dependent on Q
  • Notch with variable offset –/+ 2 octaves
  • Input with gain control
  • Inverted input with resonance dependent gain
  • Strike input for pinging the filter
  • Feedback switch which adds BP to the input for enhances resonance
  • Limiter based on tanh wave shaper which affects primary input (post gain fader)
Normal and inverted audio input
Strike input
CV inputs: 1V/oct., FM, Q, Notch frequency
Audio outputs: LP, BP, HP, Notch

3U Eurorack module, 14 HP wide, 27 mm in depth
Power consumption: 50 mA at +12 V and 50 mA at -12 V

0.15 kg
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€ 19% VAT excl. €259.66 € 19% VAT incl. €309.00
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