Buchla 252e Polyphonic Rhythmic Generator Module

Total rhythmic control

The pantheon of complex and intriguing outcomes is built on a deceptively simple design. Each of the 11 rings is broken out into “cells” (or segments), the number of which increases in value as you reach further out to the edge of the ring. By assigning pulses to cells, a signal is generated at each assigned cell, creating a rhythm that is synchronized to the master tempo, traversing the duration of the ring size (number of cells) at that tempo. Now, you can add up to two more additional rings, each with their own clock. Doing so creates distinctive polyrhythms that can either be synced “on 1” to always restart their cycle together, or “on cycl,” meaning that all cells progress at the same rate, regardless of where the first cell of the master clock resides. If you’re feeling especially ambitious, you can de-sync the clocks altogether, allowing you to scale them against the master bpm by .5x-3x, as well as modulate how early or late a pule can occur. You can even subdivide a cell into as many as seven pulses, with a further option to modify how they’re distributed in the timing of the cell’s duration.

The ins and outs of the 252e

There are four pulse outputs and six CV outputs on the 252e, all of which can be freely assigned amongst cells, with the possibility of assigning up to all six outputs to any one cell. CV values can also be fine-tuned, based on a 1.2v octave range. LEDs correspond to the interface’s RGB color scheme (for each ring-value set, respectively), with pulse outputs illuminating when in use or being modified. Cell data can be copied to one or multiple cells at a time, allowing for flexible duplication options that can make editing more streamlined if you aren’t interested in building every cell from scratch. The 252e also features separate display “layers” to accommodate the editing process by providing a visualization of each value type, where the copy function always carries over data from all layers but selectively applies what’s been copied only into whatever value that layer permits. This means your other data won’t be overwritten if you only need to carry over something like pulse timing, for example. With the addition of the optional MIDI modes, CV control and performance possibility are exponentially increased through DAW compatibility and MIDI to CV value-conversion.

Euclidean rhythm engine

Buchla’s 252e was inspired by and operates with respect to an intriguing (and humbling) musicological discovery: Euclidean rhythms. The onboard Euclidean rhythm library is its own operational basis for building polyrhythms and general inspiration. The natural question is: what is a Euclidean rhythm? Canadian computational geometer Godfried Toussaint proposed the concept in his seminal 2005 essay “The Euclidean algorithm generates traditional musical rhythms,” leading to two major points of note for Buchla, all derived from a mathematical formula first described over 2,000 years ago. For one, the algorithm could be used to describe a distribution of rhythm across the duration of a measure, essentially meaning it could describe almost any type of world music. Second, the math describes the even distribution of pulses in a sequence, allowing patterns to be shifted via an algorithm independently of any consideration of tempo, time signature, or conventional musical concept of rhythm. Doing so is the result of Euclidean “necklaces,” which are the basis of the 252e’s “phase” function, allowing you to freely rotate the pulse pattern around the ring, modifying which cell becomes number one in the sequence, without changing the actual programming.

The underlying premise that pulses could be evenly distributed across a sequence of cells is simple. However, the unconventional number of cells, combined with polyrhythmic application of two or three rings, immediately brings about a compelling rhythmic conversation. By modifying pulse duration, subdivision, distribution, late/early activation, and phase changing, unconventional and intriguingly bizarre patterns can emerge. All of these values can be controlled in real time as well. Buchla has always been known for their ability to push the envelope, and the 252e has earned its place as a coveted instrument that is as technologically fascinating as it is musically engaging.

Buchla: the crossroads of sonic excellence and game-changing technology

The name Buchla is synonymous with some of the most compelling, convention-breaking technology to emerge in the musical spheres of the mid-20th-century’s electronic awakening. A pioneer of electronic music and instrument design, Don Buchla founded his namesake company in the 1960s, following the success of a modular electronic music system that was commissioned by composers on a Rockefeller Foundation grant. For the next 50 years, Don lived on the bleeding edge of electronic music synthesis. He incorporated uncommon coding languages, touch- and pressure-sensitive surfaces, and spatial location modulation, eventually innovating for the likes of Oberheim, CBS, Zeta Music, E-Mu Systems, and Moog. Meanwhile, he also dedicated himself to make good on MIDI’s promise of the 1980s to be more than just a piano keyboard controller. By the 2000s, Don introduced his magnum opus with the 200e, a love letter to a half century of unparalleled innovation in modular and analog synthesis. Today, Buchla U.S.A. works diligently to uphold Don’s rich legacy and provide his classic designs alongside new iterations of products that are “designed to introduce the unique world of Buchla synthesis to a whole new generation of electronic music makers.”

Buchla 252e Polyphonic Rhythmic Generator Module Features:

• Unique ring/cell visual layout to program interesting polyrhythms and polymetric patterns
• 4 pule outputs and 6 CV outputs for a variety of control and performance options and modularity
• MIDI bus and MIDI-CV conversion allows further expansion and control using a DAW and external controller
• 3 freely assignable clocks for controlling individual rings, simultaneously
• Color-coded rings to track editing, as well as pulse and CV outputs
• Phase shift capability to modify patterns on the fly without altering base programming
• Flexible synchronization options allow for musically varied pattern and tempo modulation
• Euclidean rhythm generator provides compelling, malleable rhythm library