Buchla's instruments, such as the Music Easel (pictured), use a different method of timbre generation than Moog synthesizers. Moog units use oscillators with basic function generator type waveshapes and rely heavily on filtering with 24dB resonant low-pass filters, while Buchlas are geared toward complex oscillators using frequency modulation, amplitude modulation, and dynamic waveshaping to produce other forms of timbre modulation. Many of Don Buchla's designs, including the Low-Pass Gates (later called Dynamic Managers) contain vactrols, components that mate a light source (LED) with a photo resistor, the rounded slew of which give them a very "natural" sound.
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