Don Buchla answered a classified ad in the San Francisco Chronicle in 1963 looking for an engineer to build a new kind of electronic instrument, and what emerged was one of the first truly modular synthesizers ever created—a system that would fundamentally reshape how electronic music could be composed and performed.
The 100 Series is built around a wooden cabinet measuring 24 by 24 by 31 inches that houses up to 25 individual modules, each 7 inches tall and designed to generate specific classes of signals or perform particular types of signal processing. The synthesis engine centers on voltage-controlled oscillators capable of producing sine, sawtooth, and noise waveforms, paired with a comprehensive filter section including 24 dB/octave highpass and lowpass filters, 12 dB/octave bandpass filters, and phase shifters for sculpting tone. What set the Buchla apart from its contemporaries was its approach to control: rather than a traditional keyboard, the system featured flat capacitive touch-plates in various configurations—12, 20, or 10 touch-controlled voltage sources depending on the module—allowing performers to interact with the instrument in ways that felt more intuitive and expressive than conventional keys. The system also included three sequencers with 8, 8, and 16 steps respectively, enabling composers to generate repetitive passages without relying on tape loops, plus dual reverberators, envelope generators, ring modulators, and voltage-controlled gates for shaping dynamics. Crucially, Buchla separated audio and control voltage patching using stackable banana connectors, a design choice that allowed multiple control voltages to be routed simultaneously and gave the system a logical, intuitive front panel layout.
The 100 Series was designed with portability and affordability in mind—transistorized circuitry ensured reliable operation with minimal maintenance, and modular construction allowed composers to expand their systems economically over time.
