The Jerkster is a chaotic cv generator with 4 parameters: Rate, Gain, Drive,  and Damping.
These parameters interact with the underlying chaotic circuit which can be decribed by a third order differential equation. Small changes in parameters can often lead to dramatic changes in the output. The 3 cv's are derivatives of eachother and can be periodic but also make unpredictable moves based on the settings. It can be used as random source, lfo and ‘screaming noise’-generator.

It also has a with a modulation input. If the modulation signal is a vco it can sound like a waveshaper. If you send envelope cv’s in the modulation input you can (after some tweaking) create chaotic signals which relate to the incoming rhythmic pattern.

The Z output is the ‘sharpest’ , the X output is the ‘smoothest’. For periodic settings the 3 different outputs are very similar (apart from the timbre and phase).

The module is based on this circuit with the following modifications:

• There is a bicolor led indicator for each output which gives an indication what is going on in the system.

• There are only single turn potentiometers used to keep the design simple, this limits the finetuning control a bit.

• An option is added to let the modulation attenuator inject a DC voltage when nothing is plugged in in the output (this can introduce a bit of finetuning)

• It is also possible to limit the upper setting of the range control to have more focus on the lower frequency range.