Instruo I-o47

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 and quirks built in.

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, strike and a complex dual input with wave shaping limiter, the I-ō47 is truly a filter for all occasions.
Specifications

• 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)

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