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9. THE ENVELOPE GENERATOR
The Envelope Generator is one of the basic building blocks of MicroFreak. It enables you to
shape the overall loudness or the timbre of a sound.
It's a sound-sculpting tool. It can be patched to all destinations on the Matrix, including the
destinations you create yourself.
9.1. What does an Envelope Generator do?
Traditional instruments have a particular envelope (and timbre) that make it possible to
recognize them immediately. An organ attains full volume instantly, remains high for as
long as a key is depressed, and decays very quickly. A piano has a slower attack and a
longer decay. A string section will reach full volume gradually, and the volume mostly fades
gradually as well.
In Electronic Music envelope generators are also used to modulate the frequency content
of sound. The most famous example, one you've probably heard a thousand times before
without realizing what it was, is the Filter sweep.
If you want to hear this on the MicroFreak:
• on the filter set the Cutoff to minimum and Resonance to maximum
• set Amp Mod on the Envelope to ON
• on the Envelope set attack to 1.7s, decay to 7.7s, sustain to 90%, and filter amount
to 70
You should now hear the filter sweep the overtones of the oscillator. The effect is more
pronounced if you try this with an oscillator model that is rich in harmonics (overtones).
What's happening is that the filter dynamically selects a narrow harmonic band on the
oscillator. Try some oscillator models and notice the vast difference in the way the filter
affects these models.
With the MicroFreak you can go beyond these traditional envelopes and develop new ways
to sculpt the timbre and amplitude (volume) of a sound.
9.2. Gates and Triggers
By itself, an envelope generator does nothing; it needs a trigger or a gate to get started.
It is essential to understand that gates and triggers are two different things. A trigger is
a very short pulse that can be used to sync modules to each other, or in the case of the
MicroFreak, to start the LFO or the Envelopes. A gate is usually longer: anywhere from a few
milliseconds to a few seconds.
The Envelope Generator
Arturia - User Manual MicroFreak - The Envelope Generator
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