Creative Emu 1820m Manual

5 - Effects
Core Effects Descriptions
E-MU Digital Audio System71
Freq Shifter
This unusual effect is sometimes called “spectrum shifting” or “single sideband 
modulation”. Frequency shifting shifts every frequency in the signal by a fixed number 
of Hz which causes the harmonics to lose their normal relationship. The more common 
pitch shifter, in contrast, preserves the harmonic relationships of the signal and so is 
better suited to creating “musical” harmonies.
fYou can also type in 
exact frequencies...

5 - Effects
Core Effects Descriptions
72Creative Professional
Leveling Amp
The first compressors developed in the 1950’s were based on a slow-acting optical gain 
cells which were able to control the signal level in a very subtle and musical way. This 
effect is a digital recreation of the leveling amps of yesteryear. 
The leveling amp uses a large amount of “lookahead delay” to apply gentle gain 
reduction. Because of this delay, the leveling amp is not suitable for applications which 
require realtime...

5 - Effects
Core Effects Descriptions
E-MU Digital Audio System73
Lite Reverb
Reverberation is a simulation of a natural space such as a room or hall. The Lite Reverb 
algorithm is designed to simulate various rooms and reverberation plates while using 
fewer DSP resources than the Stereo Reverb. Up to five Lite Reverbs can be used at once.
Decay time defines the time it takes for the reflected sound from the room to decay or 
die away. The diagram below shows a generalized reverberation envelope.
After a...

5 - Effects
Core Effects Descriptions
74Creative Professional
Mono Delays - 100, 250, 500, 750, 1500, 3000
A delay line makes a copy of the incoming audio, holds it in memory, then plays it back 
after a predetermined time. The delay number refers to the maximum delay time that 
can be produced by the delay line. The six lengths, from 100 ms to 3 seconds, allow you 
to make the most efficient use of the effect memory resource.
Long delays produce echoes, short delays can be used for doubling or slapback...

5 - Effects
Core Effects Descriptions
E-MU Digital Audio System75
Phase Shifter
A phase shifter produces a fixed number of peaks and notches in the audio spectrum 
which can be swept up and down in frequency with a low frequency oscillator (LFO). 
This creates a swirly, ethereal sound with harmonically rich sound sources of a type of 
pitch shift with simpler sounds. The phase shifter was invented in the 1970’s and the 
characteristic sound of this device evokes emotions of that musical era.
By setting...

5 - Effects
Core Effects Descriptions
76Creative Professional
Speaker Simulator
The Speaker Simulator provides realistic guitar speaker responses and is designed for use 
with guitar, bass or synthesizer. Twelve popular guitar amp speaker cabinets are 
modeled.
There is only one parameter on this effect. Just select the speaker you want and listen. 
Normally this effect should be used with the Mix control set to 100%.
Speaker TypeDescription
British Stack 1 & 2Modeled from a British 8-speaker high power...

5 - Effects
Core Effects Descriptions
E-MU Digital Audio System77
Stereo Delays - 100, 250, 500, 750, 1500
The Stereo Delays are true stereo delay lines in that the left and right channels are kept 
entirely separate from each other. The delay number refers to the maximum delay time 
that can be produced by the delay lines. The five different lengths, from 100 ms to 1.5 
seconds, allow you to make the most efficient use of the effect memory resource.
Because the left and right channels can have different...

5 - Effects
Core Effects Descriptions
78Creative Professional
Stereo Reverb
Reverberation is a simulation of a natural space such as a room or hall. The stereo reverb 
algorithm is designed to simulate various halls, rooms and reverberation plates.
Decay time defines the time it takes for the reflected sound from the room to decay or 
die away. The diagram below shows a generalized reverberation envelope.
After a short pre-delay period, the echoes from the closest walls or ceiling are heard. 
These first...

5 - Effects
Core Effects Descriptions
E-MU Digital Audio System79
Vocal Morpher
This unique effect allows you to select two vocal phonemes and morph between them 
using an LFO. Phonemes are the consonants and vowels we use in articulating speech 
sounds and these sounds are very distinctive and evocative. 30 different phonemes are 
available and these can be shifted up or down in pitch for even more effects.
To use the Vocal Morpher, you just select Phoneme A and Phoneme B from the list of 
thirty. Now...

5 - Effects
Core Effects Descriptions
80Creative Professional
Gate
This stereo noise gate is useful both for background noise reduction applications and 
also for special effects.
The gate uses an envelope follower and threshold detector to turn on its output when 
the input signal is above the turn-on threshold, and shut down its output when the 
signal falls below the shut-off threshold. When ”turned on” the Gate passes the input 
signal through to the output at unity gain and when “shut off” the Gate...