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Chorus<br />
An audio delay in the range of 15-20 milliseconds is too short to be an echo, but is<br />
perceived by the ear as a distinctly separate sound. If we now vary the delay time in this<br />
range, an effect called chorus is created, which gives the illusion of multiple sound<br />
sources. A slight amount of feedback serves to increase the effect. A very slow LFO rate<br />
is usually best for a realistic effect, but a faster LFO rate can also be useful with minimal<br />
LFO depth (.2). Since this is a stereo chorus, an LFO phase parameter is included which<br />
can be used to widen the stereo image.<br />
Parameter Description<br />
Delay Sets the length of the delay. Range: 0ms to 20ms.<br />
Feedback Sets the amount of delayed signal that will be recirculated through<br />
the delay line. Range: 0% to 100%<br />
LFO Rate Sets the frequency of the low frequency oscillator.<br />
Range: .01Hz to 10Hz<br />
LFO Depth Sets how much the LFO affects the delay time. Increases the<br />
animation and amount of the chorus effect. Range: 0% to 100%<br />
LFO Waveform Selectable between Sine or Triangle wave.<br />
LFO L/R Phase Controls the stereo width by adjusting the phase difference of the LFO<br />
waveform between left and right channels. Range: -180° to +180°<br />
Compressor<br />
In its simplest form, an audio compressor is just an automatic gain control. When the<br />
volume gets too loud, the compressor automatically turns it down. Compressors are<br />
useful in musical applications because they allow you to record a “hotter” signal<br />
without overloading the recording device.<br />
Since the compressor turns down the gain of the signal, you might wonder how can it<br />
make the signal level stronger. A Post Gain control allows you to boost the output gain<br />
of the compressor in order to make up for the gain reduction. The overall level is higher<br />
and only turned down when the signal level gets too loud. This level is called the<br />
Threshold, which just happens to be the most important control on the compressor.<br />
In<br />
Signal path = Stereo<br />
Delay<br />
Level<br />
Control<br />
VCA<br />
Threshold Post Gain<br />
Ratio Attack Release<br />
5 - Effects<br />
Core Effects Descriptions<br />
E-MU PCI Digital Audio Systems 67<br />
Out
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