Buchla 261e Complex Waveform Generator

The Buchla 261e Complex Waveform Generator is a modular synthesizer module designed by Don Buchla in the late 1960s. It is a voltage-controlled oscillator (VCO) that produces complex waveforms, such as sawtooth, triangle, and pulse waves. It has been used by a variety of musicians, including Aphex Twin, Autechre, and Boards of Canada.

The 261e works by combining two oscillators, each with its own frequency and waveform. The oscillators can be modulated by a variety of sources, including an envelope generator, an LFO, and a noise source. The 261e also features a voltage-controlled filter, which can be used to shape the sound of the oscillators. Additionally, the 261e has a built-in ring modulator, which can be used to create unique and interesting sounds.