Specifications

Chapter 4: D-Fi 37
Alternating Rectification
This alternates between rectifying the phase of
the first negative waveform excursion to posi-
tive, then the next positive excursion to nega-
tive, and so on, throughout the waveform. The
audible effect is a halving of the audio signal’s
frequency, creating a subharmonic tone.
Alt-Max Rectification
This alternates between holding the maximum
value of the first positive excursion through the
negative excursion period, switching to rectify
the next positive excursion, and holding its
peak negative value until the next zero crossing.
The audible effect is a halving of the audio sig-
nal’s frequency, and creating a subharmonic
tone with a hollow, square wave-like timbre.
Gain
Gain allows you to adjust signal level before the
audio reaches the Post-Filter. This is particularly
useful for restoring unity gain if you have used
the Pre-Filter to cut off high frequencies prior to
rectification. The range of this control is from
–18dB to +18dB.
Post-Filter
Waveform rectification, particularly alternating
rectification, typically produces a great number
of harmonics. The Post Filter allows you to re-
move harmonics above the cutoff frequency
and smooth out the sound. This Post-Filter is
useful for filtering audio that contains subhar-
monics. To create classic subharmonic synthesis
effects, set the Pre-Filter and Post-Filter to a rela-
tively low frequency.
The range of the Post-Filter is 43 Hz to 21 kHz,
with a maximum value of Thru (which effec-
tively means bypass).
Mix
Mix adjusts the mix of the rectified waveform
with the original, unprocessed waveform.
Output Meter
The Output Meter indicates the output level of
the processed signal. Note that this meter indi-
cates the output level of the signal—not the in-
put level. If this meter clips, the signal may have
clipped on input before it reached Recti-Fi.
Monitor your send or insert signal levels closely
to prevent this from happening.
Vari-Fi
Vari-Fi is an AudioSuite-only plug-in that pro-
vides a pitch-change effect similar to a tape deck
or record turntable speeding up from or slowing
down to a complete stop. Vari-Fi preserves the
original duration of the audio selection.
Alternating rectification
Alt-Max rectification
Vari-Fi