10
E-MU Systems
RFX-32
Envelope Phaser
Envelope Phaser
The Envelope Phaser is very similar to the
RFX Phaser plug in, except that
the modulation section has been replaced with a very flexible envelope
follower. The envelope follower tracks the amplitude of the signal and
converts it to a signal that is applied to the phaser’s phase shift input.
Extensive control over the parameters of the envelope follower allow it to
be carefully tailored to a wide variety of input signals in order to achieve an
equally wide range of sonic results. The Plug-in can perform “self-
modulation” on the audio signal or can respond to the envelope of a
“sidechain” input for cross-modulation effects.
The block diagram of the Envelope Phaser is shown below.
Most parameters are ‘unitless’, which implies that to achieve a particular
effect, the plug-in must be tuned by ear to a particular input signal, rather
than analytically. Experimentation, especially with the Mod Range, Env
Attack, Env Release and Env Shape parameters, is necessary in order to
explore the wide range of sonic effects.
The Envelope Phaser itself is composed of two separate phase shifter
sections. It can be configured either as a true stereo phase shifter with
completely separate signal paths on each channel or a mono phase shifter
using only the left channel for its audio input.
-1
L
Audio Out
R
Audio In L
Audio In R
Modulation Offset
(initial freq)
Modulation
Range
MIDI Mod
11-stage Phaser
11-stage Phaser
I/O mode
mono, stereo,
stereo inverted,
mono L/env R
Attack
Envelope
Gain
Release
Envelope
Shape
MIDI Mod
Offset
MIDI Mod
Range
Feedback
Envelope
Follower
Envelope Phaser Block
