Arp 2500

module 1033 Dual Delayed Envelope

The 1033 contains two identical envelope generators. An envelope generated by the 1033 may be defined by four adjustable parameters: Attack Time, Initial Decay Time, Sustain Level and Final Decay Time. The panel graphics emphasize the effects and use of these controls. In addition, a Gate Delay control is provided to introduce a delay period of 1ms to 3 seconds between the application of a trigger pulse and the onset of the envelope attack.

An envelope is initiated when appropriate signals are applied to the Gate and Trigger inputs. When used with an ARP keyboard, the "Trigger Modes" switch gives the performer the option of of generating a new envelope each time a new key is depressed (even if another key is held down simultaneously ) or generating a new attack only when all keys have been lifted first.

Attack, Initial Decay and Final Decay have times constants variable between 0.001 seconds and 3 seconds whilst the sustain level is variable from 0 to + 10 volts.