The Instruō cèis^[2] is a fully analogue voltage-controlled ADSR envelope generator. The ADSR function generator is the model pioneered by the
East-coast mindset and is extensively used in subtractive synthesis patches. The cèis^[2] gives the ability to externally control the attack, decay, sustain, and release stages of the envelope while also emitting trigger and gate signals for each segment, offering maximum versatility from a classic tool.

This version^[2] revision brings additional flexibility and control through a completely redesigned logic extraction circuit for the segment gates,
envelope re-trigger input, and a precision throughput for voltage-controlled slew limiter capabilities.

cèis | siːs | noun (envelope) a containing structure or layer, a curve joining the successive peaks of a modulated wave

Size

8HP
Depth: 27mm

Power

+12V: 70mA
–12V: 40mA

Features

• LED button for manual control and indication of output CV level
• Fader and CV control over all 4 segments
• Gate output per segment
• LED faders for indicating segment stage when in use
• Gate/Trig modes which can force completion of the Attack duration when 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