RFX-32 Plug-ins
11
RFX-32
Envelope Phaser
A phase shifter creates a series notches in the audio spectrum similar to, but
sounding very different than, an audio flanger. A phase shifter’s notch
spacing remains constant with frequency, unlike a flanger where the notch
spacing is a harmonically related function of delay time. Feedback is used
to increase the depth of the notches and intensify the phase shift effect.
In “inverted stereo mode” the Envelope Phaser is configured in true stereo
but with the envelope follower output inverted on the right channel. This
causes the peaks and notches on the left and right channels to be swept in
opposite directions.
MIDI continuous controllers can be used to control various parameters
such as Modulation Offset, Modulation Range and Feedback.
Envelope Phaser Parameters:
Please refer to the Envelope Phaser block diagram on the previous page to
better understand the effect and modulation routings.
Mod Offset
This parameter sets a fixed degree of phase shift that is
added to the Range-scaled envelope before applying it
to the phase shifter. The difference from the RFX Phaser
is that this offset also sets a maximum offset amount
which is further modulated by the Mod Offset MIDI
modulation input.
Mod Range
This is similar to the Mod Range control on the RFX
Phaser, controlling the overall extent of phase shift that
is affected by the signal envelope. The difference is that
it now incorporates a negative range, varying from –
100% to 100%. By using a large Mod Offset value and a
negative Mod Range, the relationship between the
signal envelope and the degree of phase is inverted. This
parameter also sets the maximum amount to be
modulated by the Mod Range MIDI modulation input.
Envelope Gain
This is a gain control on the envelope input preceding
the envelope follower itself. Use it to adjust the level of
the input signal to achieve optimum excursion of the
envelope follower across the full range of phase shifting
(as scaled by Mod Range.)
Positive gain applied here can be used to compensate
for low level signals, and can also be used to inten-
tionally “peg” the envelope to the maximum phase
shift except on the lowest possible input levels; clipping
of the envelope signal does not affect the quality of the
audio signal path. Negative gain can also be used to
reduce the envelope follower response.
In current EOS releases (as of 4.61) the Emulator front
panel master volume control is applied before the RFX
board, and will affect how the envelope follower reacts
