The Model 266e Source of Uncertainty is a general source of musical unpredictability. Divided into 4 sections, each section serves a unique function.

Noise comes in three flavors. White noise is electrically flat, but acoustically balanced toward the high end of the spectrum (+3 db/octave). Integrated white noise has a low spectral bias (-3 db/octave). Musically flat noise has a flat spectrum (constant energy per octave) and is a particularly useful source for subsequent processing.

Fluctuating Random Voltages are continuously variable, with voltage control of bandwidth over the range of .05 to 50 Hz, making possible changes that vary from barely perceptible movement to rapid fluctuation.

Quantized Random Voltages change on receipt of pulses. Their number of states is voltage controllable from two to twenty-four, and their distribution can be varied both spatially and temporally.

Stored Random Voltages have three parameters under voltage control. Degree varies the amount of randomness; chaos alters the distribution from just a little uncertain to total chaos; while skew biases the randomness toward one extreme or the other.

All settings of the 266 may be stored and recalled under control of the model 225e or 206e preset manager.