THIS IS HOW WE DEFORM: MODEL 257 DUAL VOLTAGE PROCESSOR

The 257 is certainly a necessity for any Buchla system,  as it allows applied voltages to be summed and twiddled with (attenuated/reversed,  cross-faded, general offset) to taste. That is certainly a vital function for the noise-driven synthesist who resists keyboards, presets, and presumably "music" itself.