Akai EWV2000 User Manual

How the EWV2000 Works
8
The EWV2000 EWI & EVI Sound Module is a synthesizer sound
module played with the EWI 1000 or EVI 1000 wind instrument style
controller.
It is basically two monophonic synthesizers combined into one unit,
and can produce two different sounds simultaneously. Also, it is
equipped with an external input jack, so it can be used to process or
play voices from another synthesizer or a digital sampler.
Sounds consist of three components — pitch, tone, and volume.
Pitch =* the height of the sound
Tone =* how harmonics are incorporated into the sound
Volume =* the strength of the sound
The tone peculiar to acoustic instruments such as pianos, violins,
flutes, or organs is formed by envelopes (the way the sound is pro
duced), which are variations of these three components over time.
The tone is particularly governed by the envelopes for the harmonics
d the strength of the sound.
Level
Envelope
A—Attack lime
D — Decay time
-Time S — Sustain time
R —Release time
The envelopes for acoustic instruments can largely be classified into
four distinctive types:
1) Percussion-
striking
R (short)
Bam
Time
R (long)
Baaam
Time
Level
2) Strings-
played with a bow
S (maximum)
Slow attack
A (short or longish)
Level
3) Strings-
played with a finger
D (short or longish)
: II string is released
• Time
Level
4) Winds-
blowing
D (short)
S (80% - 95%)
' A (short or longish)
R (short)
-Time
The above envelopes are mainly for the strength of the sound. The
harmonics also change in the same way.
When the level is high,
there are many
harmonics
I i
I i I I
|« I S S
§o S -° Y
U- C f— —. CO
.si a a a
When the level is low,
there are few
harmonics.
o o o
I 1 1
With a synthesizer, the strength of the sound and the amount of
harmonics are generated by the "EG", the envelope generator. The
synthesizer is designed so that many different sounds can be created.
Audio
signal
o
Output
Change of pitch
Change of harmonics
Change of volume
Basically, a voice is generated when the VCF (voltage controlled
filter) adds the changes of the harmonics to the audio signal (sound
source) output from the VCO (voltage controlled oscillator), and the
VCA (voltage controlled amplifier) adds the changes to the strength
of the sound. There are also sounds which can only be produced by
adding an envelope to the VCO to obtain changes in pitch (such as the
sounds of cats, dogs, birds, or other animals, as well as humans).
Furthermore, if the synthesizer is to be called an "instrument", it
must have a controller to make it possible to play in any key and pitch.
Conventional synthesizers used keyboard type controllers. The
EWV2000 uses wind instrument type controllers. The EWV2000 is de
signed to obtain the key and pitch by changes in a special control vol
tage.
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Akai EWV2000 Specifications

General

Brand	Akai
Model	EWV2000
Category	Recording Equipment
Language	English