Instruo - Ceis [2] The Instruō cèis[2] is a fully analogue voltage controlled ADSR envelopegenerator. The ADSR function generator is the model pioneered by theEast-coast mindset and is extensively used in subtractive synthesis patches.The cèis[2] gives the ability to externally control the attack, decay, sustain, andrelease stages of the envelope while also emitting trigger and gate signals foreach segment, offering maximum versatility from a classic tool.This version[2] revision brings additional flexibility and control through acompletely redesigned logic extraction circuit for the segment gates,envelope re-trigger input, and a precision throughput for voltage controlledslew limiter capabilities.Features• LED button for manual control and indication of output CV level• Fader and CV control over all 4 segments• Gate output per segment• Fader LED for segment stage indication• Gate/Trig modes which can force completion of the Attack durationwhen triggered• Hold mode for sustain segment lock for CV slew use• Combined trigger output which fires when there is a change in segment• Variable envelope response shape from linear to exponential