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Summary of Contents for Instruo ceis 2
- Page 1 cèis ADSR User Manual...
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Page 2: Table Of Contents
Contents Description / Features Installation / Specifications Overview Inputs / Outputs Envelope Controls Logic Extraction & Slew Limiting Patch Examples - Retriggered East Coast Synth Voice - Vibrato Swell - Burst Generator - CV Slew Limiter... - Page 3 Description The Instruō cèis 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 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.
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Page 4: Installation
Installation 1. Confirm that the Eurorack synthesiser system is powered off. 2. Locate 8 HP of space in your Eurorack synthesiser case. 3. Connect the 10 pin side of the IDC power cable to the 2x5 pin header on the back of the module, confirming that the red stripe on the power cable is connected to -12V. - Page 5 cèis | si:s | noun (envelope) a containing structure or layer, a curve joining the successive peaks of a modulated wave RETRIG HOLD GATE TRIG cèis 1. CV Output 1 1. Decay CV Input 2. Gate/Trig Button 12. Decay Gate Output 3.
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Page 6: Inputs / Outputs
Inputs / Ouputs CV Output (OUT): CV Output is a bipolar control voltage output. • Output range for envelope generation: 0V to 10V • Output range for CV through: -10V to 10V Gate/Trig Button: Gate/Trig Button will force an envelope signal from the CV Output when pressed. -
Page 7: Trigger Signals
• A trigger signal at the Gate/Trig Input (or a gate signal with a duration shorter than the attack and/or decay stages), will force the envelope to prematurely jump to the release stage. Trig Mode: When set to Trig Mode and gate signals are received at the Gate/Trig Input, all envelope stages will complete as expected if the... -
Page 8: Envelope Controls
Envelope Controls Attack Slider: Attack Slider defines the onset duration of the envelope. The value set by this control is measured in the time domain. • Moving the slider upward will increase the attack duration. • Moving the slider downward will decrease the attack duration. •... - Page 9 Sustain Slider: Sustain Slider defines the resting voltage level of the envelope signal once the decay stage has been completed. The value set by this control is not measured in the time domain, but instead is measured as a variable voltage amplitude. Once the attack and decay stages have been completed, the sustain stage will be held for the remaining duration of the gate signal.
- Page 10 Release Gate Output: Release Gate Output generates a gate signal that is held HIGH for the duration of the release stage. • Output voltage: 10V. Shape Knob: Shape Knob controls the envelope’s contours. • The knob smoothly morphs between two response curves. •...
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Page 11: Logic Extraction & Slew Limiting
Logic Extraction & Slew Limiting When the Gate/Trig Toggle is set to Hold Mode, cèis functionality is optimised for use as a voltage-controlled slew limiter. • The Sustain CV Input becomes a control voltage input for signals to be slewed. •... -
Page 12: Patch Examples
Patch Examples Retriggered East Coast Synth Voice: Summary: dàil sends voltage to the oscillator while simultaneously triggering (and retriggering cèis ). The CV Output of cèis opens the filter and VCA, allowing the oscillator signal to pass through. More traditional East Coast patches would incorporate separate cèis modules for the filter and VCA. - Page 13 Control Path: • Connect a USB MIDI controller to dàil and set it to MIDI-to-CV Mode. • Connect the CV output of dàil to a buffered multiple. • A buffered multiple will keep the signal from dropping voltage when split. •...
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Page 14: Vibrato Swell
Vibrato Swell: Summary: Every time dàil plays a new note, the CV signal of a secondary cèis slowly opens VCA 2, increasing the amount of modulation the LFO can apply to the FM input of the oscillator. Output Audio Path: •... - Page 15 Control Path: • Create the East Coast Synth Voice control path. • Connect the CV output of an unsynchronised LFO to the input of a VCA 2 and set the rate of the LFO to a desired position (typically 5 - 7 Hz).
- Page 16 Burst Generator: Summary: Every Time cèis is triggered, a burst of trigger signals will strike the low pass filter allowing the oscillator signal to pass through. Combined Trigger Output For added modulation, multiply the signal and connect it to both the strike input of the low pass filter and the clock input of a sequencer and connect the CV output of the sequencer to the 1V/Octave input of the oscillator.
- Page 17 CV Slew Limiter: Summary: East Coast Synth Voice Adapting the – dàil’s voltage is slewed through cèis , creating a portamento (glide) effect between successive notes. Output Audio Path: • Create the East Coast Synth Voice audio path. Control Path: •...
- Page 18 • Set the Attack Decay Sliders to desired positions. The Attack Slider will set the amount of portamento between ascending notes, while the Decay Slider will set the amount of portamento between descending notes. Manual Author: Collin Russell Manual Design: Dominic D’Sylva This device meets the requirements of the following standards: EN55032, EN55103-2, EN61000-3-2, EN61000-3-3, EN62311.
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