Instruo I-ō47

Name: I-ō47
Brand: Instruo

Modern multimode resonator/filter inspired by the ARP 2500 1047

14 HP Eurorack module

I-ō47 is a multimode resonator/filter inspired by the classic ARP 2500 1047, featuring a hybrid design of matched transistor pairs and precision op-amps. It provides simultaneous low pass, high pass, band pass, and notch outputs at a steep -18dB/oct slope. With an on-board limiter/waveshaper, exponential FM, variable notch with CV, pingable resonance via Strike input, an inverting secondary input with dynamic amplitude tied to Q, and a feedback toggle for self-oscillation, I-ō47 is a versatile filter that doubles as a sine wave oscillator and percussion source.

Features

Simultaneous LP, HP, BP, and Notch filter outputs
-18dB/oct slope on LP and HP, -6 to -18dB/oct on BP
Self-oscillating resonance with feedback toggle
1V/Oct tracking for pitch-accurate oscillator use
Strike input for pingable resonance and hard-sync effects
Variable notch with CV-controllable centre frequency offset
On-board tanh limiter/waveshaper on primary input
Inverting secondary input with Q-linked amplitude reduction
Exponential FM input with bipolar attenuverter
Hybrid semi-discrete VCA design with matched transistor pairs
Frequency range: 16Hz to 16kHz
Quadrature sine waveform oscillator when self-oscillating

Controls & Jacks (19)

Coarse
Fine
FM Attenuverter
Q
Notch
Input
Limiter
Gain
Inverting Input
1V/Oct
Strike
Feedback
LP Output
FM
BP Output
Notch CV
HP Output
Q CV
Notch Output

How-To Guides

East Coast Synth Voice
Sine Wave Oscillator
Phaser Effect
Percussion: Kick Drum
Dynamic Input Crossfade

Explore the interactive I-ō47 panel on BleepDex — tap any control to learn what it does.

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How-To Guides

Instruo I-ō47

Features

Controls & Jacks (19)

How-To Guides

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