Permutation: a random sequencer based on the Turing Machine

Permutation uses a digital shift register to generate unpredictable CV and gate patterns that can be locked into repeating loops. The concept is based on the Turing Machine, an open source module designed by Tom Whitwell, which takes inspiration from vintage analog randomization circuits such the Buchla 266 "Source of Uncertainty" module.

These modules retain the core functionality of the Turing Machine while adding new features such as dedicated pulse outputs for each bit of the shift register, CV inputs for all parameters, and an internal bipolar VCA. Locked sequences are also saved across power cycles automatically to facilitate easier recording and live performance.

Variant is an expander module based on the Voltages expander for the Turing Machine. Gate voltages from the first 8 steps of Permutation are combined using a mixing console paradigm. Gates are shifted to the next mixer channel with each clock pulse, providing dynamic variations of the mix. Positive and negative mix outputs are provided, each with scaling knobs and CV inputs.