Epoch Modular Benjolin

Benjolin is a chaotic synthesizer module designed by Rob Hordijk, also using the same circuitry as the Blippoo Box by Rob Hordijk. Benjolin consists of two VCOs, one state variable filter and a unique "Rungler" circuit. By combining these with each other, it is possible to create chaotic sound movements from instantaneous changes to gently changing sound patterns.

The Rungler is an 8-step shift register that uses oscillator A as the signal input and oscillator B as the clock. The output of the shift register becomes a stepped voltage of various speeds and ranges, and is fed back to the pitch of oscillators A and B (RUN-A and RUN-B are the feedback attenuators).

The filter is equipped with a distortion similar to a unique vacuum tube, raises the resonance, and is most noticeable when both A and B oscillators are operating in the audio range. The filter receives the square wave created by passing oscillators A and B through a comparator, and the Rungler output signal itself. Like Oscillators A and B, the filters can be easily modulated by the Rungler signal, with the Run F knob acting as an attenuator. The oscillator and filter frequency CV inputs are internally connected to the triangle wave of either oscillator, making patching easier.

* Since this module does not have the primary purpose of producing a sound that matches the scale, the trackable range of 1V / Oct of the oscillator is about one octave.