I-ō47 Multimode Resonator/Filter draws its circuit design inspiration from the classic 1047 module of the ARP2500 system.
Built upon the classic circuit architecture of the original, the design was refined with extensive experimentation using modern components along side classic configurations of discrete parts.
The internal VCA’s are a new hybrid design of matched transistors and precision op-amps.
Various refinements were also added such as voltage control over the variable notch offset which opens new worlds of dynamic sweeps and shaping.
There are two audio inputs on the I-ō47. The top runs through a gain stage, set by the fader, and has an optional limiter in line with it selected by the LIM toggle switch.
This limiter is an implementation of the tanh wave shaper circuit which applies the soft curvature of the tanh expression to any input signal. The gain fader sits before the limiter allowing for precise control over the amount of warm saturation that occurs with this style of limiting.
With a simple sawtooth wave, the limiter will gently curve the ramp and result in subtle enhancement of the low end of the signal’s tone.
For more complex audio signals (drum voices work a treat!) the limiter will give very musical results akin to gentle compression/overdrive, all the way to limiting and saturation.
The inverting input inverts the polarity of the input signal. This input is also directly affected in amplitude by the Q (resonance) control. As resonance increases, the signal amplitude will decrease, acting as a form of automatic gain compensation.
