User Manual

31
Pro 3 User’s Guide
Filters
Filter Envelope
The Pro 3 lter has a dedicated, 5-stage envelope generator (attack,
decay, sustain, release, plus delay). The Filter Envelope is used to shape
the harmonic characteristics of a synthesized sound by giving you lter-
ing control with these stages.
This is one of the most important aspects of a synthesized sound. Without
an envelope, the lters would be static and unchanging. They would stay
open or closed by a xed amount that wouldn’t change over the duration
of a sound. That’s not very expressive or interesting to listen to — and
it’s not how most real-world instruments behave.
In general, sounds produced by an acoustic instrument are brighter at
their beginning (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 lter envelope is designed to emulate.
VELOCITY ATTACK DECAY SUSTAIN RELEASE AMOUNT
ATTACK DECAY SUSTAIN RELEASEAUX ENV AMOUNT
VELOCITY ATTACK DECAY SUSTAIN RELEASE AMOUNT
1 2
ENVELOPES
AMP
FILTER
AUX
Filter Envelope
attack decay sustain release
amplitude
time
note offnote on
delay
A typical 5-stage DADSR envelope