22 Filter Envelope
Dave Smith Instruments
Filter Envelope
The OB-6 filter has a dedicated, four-stage envelope generator. The Filter
Envelope is used to shape the harmonic characteristics of a synthesized
sound by giving you filtering control over its attack, decay, sustain, and
release stages.
This is one of the most important factors in designing a sound. Without
an envelope, the filters would be completely static. They would stay
open or closed by a fixed amount that wouldn’t change over the duration
of a sound. That’s not very interesting to listen to and it’s not how instru-
ments behave in the real world.
In general, sounds produced by an instrument are brighter at their begin-
ning (the attack stage) and grow mellower as they die out (the decay
and release stages). In other words, their harmonic content changes over
time. This is exactly what the filter envelope is designed to emulate.
FILTER ENVELOPE
ATTACK
DECAY
SUSTAIN
RELEASE
AMOUNT
VELOCITY
ENVELOPES
Filter Envelope
Attack
Decay
Sustain
Release
Amplitude
Time
A typical 4-stage envelope
Summary of Contents for ob-6
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