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Reverse Reverb: A reverb program with an inverted amplitude envelope, i.e. the effect starts softly and
then increases in volume. This effect used to be created by playing a tape in reverse direction, recording
the reverb signal, and then playing back the tape in forward direction again, with the result that the reverb
signal was played back before the actual input signal. VARIATION controls the length of the signal,
EDIT A the delay, and EDIT B the threshold above which the effect responds.
1.4.2 Special effects
Vocal Distortion: A clearly up-to-date program for lo-fi effects applied to vocals or drum loops,
combined with a delay. VARIATION determines the degree of distortion in 32 steps, EDIT A controls
the delay of the left channel from 0 to 630 ms. The right channel is coupled to the left one and can be
delayed in the time domain from 0 through 420 ms. EDIT B governs the delay mix. As a little extra the
distortion circuit also includes an LFO-controlled notch filter which audibly wanders back and forth with
maximum distortion (VARIATION 24 and higher).
Rotary Speaker: Simulation of the legendary rotary speaker effect produced by speakers rotating at
slow/fast speed within a bulky cabinet. The effect uses the physical principle known as Doppler effect.
VARIATION changes the frequency response (higher value = less high frequencies). Settings of 24 and
higher also simulate the tube distortion that was produced by the original cabinets in the 70's. EDIT A
controls the speed of the horn-loaded speaker (treble range), EDIT B that of the rotor (bass range).
Vocoder: Another all time favorite that has gained new popularity during the disco music renaissance of
the past few years ("Around the World" by Daft Punk or "California" by TuPac). Basically, a control signal
(usually vocals) in the right channel is used to modulate another signal in the left (e.g. synth sound),
which sounds as if the synth was talking (robot voice). VARIATION determines the type of vocoder,
EDIT A the degree of distortion, and EDIT B the effect sensitivity.
1.4.3 Modulation and pitch shifter effects
Pitch: This effect transposes the input signal either in cents (EDIT A – producing a light detune effect)
or semi-tones (EDIT B – up/down to one octave). Settings can be made independently for both
channels, so as to create harmonies or simply to widen the sound of a single voice. The pitch effect can
also be used to produce a cartoon character type voice effect.
Flanger: An LFO constantly modulates the effect signal's pitch by a few cents up and down. The LFO
speed is controlled by VARIATION, the amount of pitch modulation by EDIT A, the portion of the effect
signal fed back to the effect block (= feedback) can be determined with EDIT B. By the way, you can
separately control the channels' modulation depth and feedback, which allows for highly complex
modulations. Flanger effects are primarily used for guitars, but there are also lots of other useful
applications: voices, cymbals, bass, remixes, etc.
Chorus: Though similar to the flanger, chorus uses a delay function instead of feedback. Combined with
the pitch shifting feature, the delay produces a very pleasant detune effect. VARIATION changes the
modulation frequency, EDIT A controls the delay and EDIT B the modulation depth. Chorus effects are
used so often and in such a variety of applications that any recommendation would mean a limitation of
their use.
1.4.4 Effect algorithm combinations (multi-effects programs)
Effect algorithms nos. 20 through 24 are multi-effects algorithms combining various effect types with, for
instance, a reverb algorithm, and can hence be used simultaneously. For example, effect #24 allows you to
chorus a lead guitar sound and at the same time add some room reverb. (See figure 2.1 "Serial effect
combinations".)
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VIRTUALIZER PRO DSP1024P
1. INTRODUCTION
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