The attached manual describes the 2hp EG, a compact two-stage envelope generator. On its own, EG does not generate pitch or sound, but in a Eurorack system it is very useful for shaping melodic events by controlling:
Because this module has: - trigger/gate input - attack and decay CV - linear/exponential response switching - output attenuation - 0–10V envelope output - very wide time range: 3 ms to 11 minutes per stage
it can be used as a highly flexible modulation source for melodic patching.
A melodic part usually needs a few things:
The EG covers items 3 and 4 directly, and can also contribute to 1 indirectly by modulating pitch-sensitive inputs.
So when used with: - a sequencer - a quantizer - an oscillator - a VCA - optionally a filter
the EG becomes the part of the system that makes notes feel musical rather than mechanical.
This is the most direct use.
Each trigger creates an attack-decay contour controlling note volume. This gives every note a defined beginning and end.
EG is especially strong for short attack/decay envelopes.
A plucked synth voice with strong transient definition.
The manual states each stage can go as short as 3 ms, which is ideal for: - acid-like plucks - marimba-like synth tones - arpeggios - short bass melodies
A very musical approach is to send the same envelope to both VCA and filter.
Every note opens in both amplitude and timbre at once, making simple pitch sequences sound expressive.
This is one of the best ways to turn a plain sequence into a melodic phrase.
Because EG outputs 0–10V, it can be used carefully to modulate oscillator pitch.
At note onset, pitch briefly rises or falls depending on modulation polarity and routing.
The raw envelope range is large, so for pitch modulation you usually want heavy attenuation before the oscillator pitch input unless the oscillator has a very small-depth FM/mod input.
A standout feature of EG is CV over both attack and decay.
This means another modulation source can vary articulation over time, so your melody breathes and evolves.
Different notes can have: - different lengths - different sharpness - different emotional character
Even with a fixed pitch sequence, changing envelope shape creates the perception of a more composed, expressive melody.
Since EG responds to trigger or gate signals, you can use rhythmic gate streams to articulate melodic lines.
The EG converts timing information into shaped note gestures.
If your sequencer produces different rhythmic patterns, the envelope can turn them into: - short stabs - swelling notes - legato-like overlaps, depending on settings downstream
This is especially useful when melodic interest comes from rhythm more than pitch complexity.
Use EG on only part of a patch to create dynamic note emphasis.
Only accented steps receive extra brightness or harmonic intensity.
This is excellent for: - techno sequences - acid lines - bass melodies - repeating ostinatos that need variation
Instead of changing the pitch, you change the expression of selected notes.
The manual gives a maximum stage length of 11 minutes per stage, which is unusually long.
Extremely slow rises and falls can shape an ambient melodic texture over long time spans.
This makes EG useful not only for note-level articulation, but also for macro-level melodic development.
The response toggle is one of the most musically significant controls.
Best for: - precise, synthetic shapes - even modulation sweeps - patching to pitch or parameter CV where you want predictable movement
More neutral, straight, and controlled.
Best for: - plucks - natural-feeling note articulation - punchy melodic accents - VCA and filter shaping
More lively and “acoustic” in feel, with stronger perceived transients.
For most melodic voice articulation: - start with exponential - switch to linear if you want a cleaner or less punchy contour
Suggested settings - Attack: low - Decay: medium - Response: exponential - AMP: around 50–75%
Result Playable, expressive mono lead voice.
Suggested settings - Attack: minimum - Decay: short - Response: exponential
Result Tight, melodic plucks ideal for arps and basslines.
Suggested settings - Attack: medium to long - Decay: long - Response: linear for smoothness
Result Melodic notes with constantly shifting articulation, ideal for ambient or generative music.
Suggested settings - Attack: very short - Decay: short-medium - Response: exponential
Result Selected notes snap brighter and slightly bend, creating animated acid-like phrasing.
At 2hp, it adds expressive control without consuming valuable rack space.
From very fast transient shaping to ultra-slow phrase development.
This is especially helpful for melodic variation and generative patching.
The built-in AMP control makes it easier to dial modulation depth without needing another attenuator in some patches.
Linear/exponential switching gives you two very different articulation feels from one compact module.
Based on the manual, this is a two-stage attack-decay envelope, so:
For sustained keyboard-style melodic phrasing, another envelope type might be better, but for sequenced melodic lines this AD design is often perfect.
To build full melodic functionality around EG, pair it with:
The 2hp EG is a compact but powerful tool for making melodic patches feel alive. It does not create melody by itself, but it is excellent for shaping the expressive side of melody:
If used with a sequencer, oscillator, VCA, and optionally a filter, it can produce: - plucked melodies - expressive leads - accented basslines - evolving ambient phrases - generative articulation changes
Its biggest melodic strengths are the wide time range, CV over attack/decay, and linear/exponential switch, all of which help transform simple note sequences into more musical performances.