ART Pro Audio Quadra/Fx - Two Channel Effects Processor - Manual (Page 57)

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TREMOLO
Tremolo is a volume effect that fades a signal’s level in and out. The Low
Frequency Oscillator (LFO) Speed determines the fade rate and LFO Shape
determines the fade pattern. Some of the Panner classes have dynamics
sensing, which can use input level to switch the effect in and out or trigger
the LFO.
TREMOLO CLASSES:
Vocal
Vocal Tremolo is the traditional tremolo effect with the addition of dynamics sensing, which can be used to
fade the effect in and out if the Threshold level is crossed. Threshold is set with the Special parameter and
Decay sets the effect’s fade times.
Instrument
Instrument Tremolo recreates the sound of the classic guitar tremolo. As LFO Speed is increased, Width is
automatically adjusted to emulate the musicality of classic analog circuitry.
Concert
The Concert Tremolo is full-featured with completely independent control over LFO Width and Speed.
Gated
The Gated Tremolo is the Instrument effect with the addition of dynamics sensing, which can be used to
duck the effect in and out depending on the Threshold level. Threshold is set with the Special parameter.
Ambient
The Ambient Tremolo is a “spatial” effect that can fades the difference information in a stereo mix. Difference
information is the part of a mix that does not occur equally in both of the stereo channels, often such as
guitars, backing vocals, and reverb tails. Instruments like lead vocals, bass, and some drums are often mixed
to the center, creating the common information (common between the left and right channels). This algorithm
processes either the difference information or the full mix (consisting of both difference and common
information), depending on the Difference Factor setting (see the Special parameter below). Try Factory
Preset #89 with your favorite CDs and then on your own stereo tracks or mixes. Due to its stereo nature, this
class is not available in Discrete 4 routing.
Dynamic
A Dynamic Tremolo will trigger the LFO through one cycle of its sweep when the input signal crosses above
the programmed Threshold level. When the input signal crosses back, the LFO is reset and will trigger again
the next time the input signal crosses over the Threshold. Threshold is set with the Special parameter.