Plucked contour
Trigger into Sigil · Rise short · Fall medium · Shape around noon · OUT to VCA CV · classic pluck with a controllable tail and an EOC pulse ready to fire the next event.
Compact analog function generator. Voltage-controlled rise and fall, cycle toggle, variable exp-to-log shape, trigger/slew jumper, EOC pulse, and bipolar output attenuverter in 4HP.
Patch Ideas · 4
Self-running slope
Cycle on · Shape toward log for longer arcs · EOC patched back to the input · one button turns the module into a looping LFO with voltage-controlled timing.
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Asymmetric glide
Rear jumper in slew mode · pitch CV into the input · Rise faster than Fall · OUT to VCO V/Oct · upward moves snap while downward moves drift, which makes the same line feel hand-played.
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Toggle ratchet
Positive trigger pulses into the Cycle CV input · Cycle state flips each hit · OUT alternates between envelope and LFO behavior without touching the panel, which makes it useful for ratchets and wobble basses.
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Behaviors
Envelope mode trigger into input
A trigger fires the rise and fall stages as a compact AD-style envelope. With a gate held high, it behaves like a longer ASR contour.
Cycle toggle Cycle button or Cycle CV
Cycle mode loops the envelope into a self-running LFO. A high pulse on Cycle CV flips the mode state rather than acting as a level input.
Slope morphing Shape knob
The single Shape control bends both rise and fall curves together, from snappy exponential response through linear to slower logarithmic motion.
Slew limiter mode rear jumper set to slew
The input becomes a slew limiter instead of a trigger input. That lets Sigil smooth pitch or CV lines and accept gates or audio as control-rate material.
EOC chaining EOC pulse
End-of-cycle pulses are ready to trigger the next envelope or clock another module. This makes chained ping-pong or ratchet-style patches easy.
Bipolar output Output attenuverter
The output stage can invert the envelope and stretch it into a bipolar control signal. Negative settings make the same contour pull down instead of push up.
Controls
| Global | Rise | Sets attack / rise time. CW: longer · voltage-controlled |
| Global | Fall | Sets decay / fall time. CW: longer · voltage-controlled |
| Global | Shape | Morphs both slopes from exponential to linear to logarithmic. CCW: exp · noon: linear · CW: log |
| Global | Output Attenuverter | Scales and inverts the output. -10V to +10V range |
| Global | Cycle | Manually toggles cycle mode on and off. momentary button |
I/O
IN · 4
- Cycle CV +/-5V CVCV input that toggles cycle mode when it crosses the high threshold.NORM → off
- Trigger / Slew In trigger or audio / CV GATETrigger input in envelope mode; slew input when the rear jumper is set for slew behavior.
- Rise CV +/-5V CVVoltage control over rise time.
- Fall CV +/-5V CVVoltage control over fall time.
OUT · 2
- EOC 0-10V gate GATEEnd-of-cycle trigger output.
- OUT +/-10VMain function output, shaped by the attenuverter.