E-Mu Proteus 1000, Руководство по эксплуатации

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154 E-MU Systems
Effects
General Effect Descriptions
The Proteus 1000 flanger is a stereo device consisting of two separate delay
lines controlled by a single set of controls. A Low Frequency Oscillator
(LFO) varies this initial delay setting, changing the frequency of the
notches and adding animation to the sound. LFO Rate controls the rate of
change and LFO Depth controls how much the LFO changes the delay.
The Feedback control sends some of the delayed signal through the delay
line again. When feedback is used the comb filter notches are deepened.
Delay
Delay is an effect which can be used for doubling, reverb pre-delay, or
echoes.
Delay Time is variable from 0-635 mS and controls the time between
echoes. Feedback and determines how long the echoes continue sounding.
“Infinite” delay effects are also possible without the risk of runaway.
Stereo Delay
Similar to delay except that the delay line outputs a stereo signal from the
mono input. The two output signals are a few milliseconds apart to create a
stereo image. The delay times are variable from 0-635 mS.
Panning Delay
A panning delay is similar to the normal delay lines except that the echoes
bounce back and forth between the two stereo speakers.
Dual Tap
These are delay lines where the signal is “tapped off” at two unevenly
spaced locations. When feedback is used, multiple complex echoes are
produced. The fraction in some of the algorithm names (i.e. 1/3, 1/4) refers
to the time ratio between the taps.
Vibrato
Basically, this a delay line modulated by an LFO, but with none of the
original signal added in. The LFO modulation creates a Doppler shift and a
resultant cyclical pitch shift. The vibrato created in this manner sounds
very different than vibrato created by frequency modulating the sample.
Distortion
Distortion uses a technique called “soft-clipping” to create additional
harmonics in the signal. As the level increases, the top of the waveform
becomes somewhat squared. As the level increases further, it transforms
into a true square wave.
Soft clipping gradually squares the edges of the waveform as the amplitude is increased.