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. I-ō47 | ʌɪ-əʊ-ˈfɔːti-ˈsɛv(ə)n | noun (signal processing) the in’s and out’s of a classic multimode filter/resonator. Size 14HPDepth: 27mm Power +12V: 50mA–12V: 50mA Specifications Centre frequency range 16Hz to 16KHz 1V/octave, Coarse and Fine frequency controls FM input with attenuverter Low pass 18 dB/octave High pass 18 dB/octave Band pass ~6 – 18 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)
