At the introduction of a V-trigger signal from an external source, the SW911 Envelope Generator produces a single voltage contour whose time/voltage variation is determined by potentiometers T1, T2, T3, and a time constant sustaining level potentiometer (Esus). The release of the V-Trigger signal will direct the voltage contour to T3 (final decay) regardless of what stage (T1, T2 or E) was in current operation. This Module is based on the original design from 1968 MUSICAL APPLICATION The SW911 Envelope Generator completes one of the most important musical functions: That of producing a variable one-shot control voltage contour in time. This output is thus capable of controlling any voltage controlled module – most notably a Voltage Controlled Amplifier – resulting in the articulation of a single sound. Keyboard controllers initiate a trigger on every key, which is depressed in sequence specifically to fire the envelope generator. Ribbon Controllers, Sequencial Controller Complements and Envelope Followers, all output V-trigger which initiate the action of this module as well. Characteristic spectral sweeps associated with the articulation of a note by an acoustic instrument are simulated by utilizing the Envelope Generator to control the frequency cutoff of the SW 904A Low Pass Filter, SW 904B High Pass Filter or other associated modules. With considerable attenuation, the Envelope Generator can create tunable glissandi when controlling a single oscillator. Envelope Generators are used in association with the SW 911A Dual Trigger Delay to create multiple or combined DC voltage contour outputs. TECHNICAL SPECIFICATION Trigger Input: V-Trigger (internally converted to S-Trigger) Time Range on T1, T2, T3: 2 msec to 10 sec Peak DC output on Esus: 5,5 Volt Power Requirements: +/-15 Volt at + 25 mA / - 20 mA Depth: 160 mm
