12
E-MU Systems
RFX-32
Envelope Phaser
to input signals. Env Gain can thus be used to make-up
for less-than-full-scale settings of the master volume
control.
Envelope Attack
This unit-less parameter sets the attack rate of the
envelope follower, controlling how quickly it responds
to increasing signal levels. It can be varied from the
slowest setting, which is nearly a signal “hold”, to the
fastest setting of 30, which is essentially an instanta-
neous response. Typically useful values are in the range
of 15 to 30.
Envelope Release
This parameter varies along the same values as the Env
Attack, setting the rate that the envelope follower
responds to decreasing signal levels. Typically useful
values are in the range of 5 to 25.
Envelope Response
This parameter varies along a continuum of 5 values,
warping the “shape” of the envelope follower response
from fully linear to fully logarithmic. This control is
very useful, especially in conjunction with the Env Gain
and Env Release parameters, for optimizing the way in
which audio signals with different dynamic ranges and
“crest factors” affect the degree of phase shift.
A logarithmic response can often be used to smooth out
the envelope of signals with erratic amplitude response
without slowing the attack time. Conversely, a linear
shape makes the envelope follower more sensitive to
small amplitude changes, and can be used to elicit more
active phase shifter response from signals lacking in
dynamic range.
MIDI Controls
Wet/Dry Mix
FX Input Level
FX Output Level
Modulation Offset
Modulation Range
Feedback
Feedback
This parameter controls the amount and polarity of the
signal recirculated through the phase shift network,
from -100% to 100%.
Negative feedback has a somewhat different sonic
character from positive feedback, and when the
Feedback parameter is set negative with any of the
Inverted I/O modes, the left channel will use positive
feedback and the right channel will use negative
feedback.
.The feedback control is more dramatic when the phase
shifter is in a monophonic input mode, since the left
and right phase shift networks are then connected in
series. At values of 100%, the phase shifter will remain
stable, on the verge of self-oscillation.
