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DE-10 Owner’s Manual
Digital Effect Functions
The DE-10 achieves superb ambience effects by employing the Fostex A.S.P. (Fostex Advanced Signal Processing
Technology*), as well as simulations of microphones/amplifiers with overwhelming reality by employing the
newly developed "A.S.P. +".
*H. F. A. (Harmonic Feedback Algorithm)
There is one of indispensable elements in the natural echo called “Early Reflection sound”, which is usually sacrificed in
commercial reverb products in order to reduce costs. (In practice, the Early Reflection sound means the very first rever-
berated sound that bounces back from walls, floors and ceilings of concert halls). The entire reverb sound quality depends
on this Early Reflection sound and how closely it can resemble the real echo. The H. F. A. is an algorithm that enables the
effect unit to reproduce a clear and natural Early Reflection sound by applying an ideal harmonic feedback to each delay
module.
*H. D. L. P. (Hi-Density Logarithmic Processing)
The reverb sounds consist of lots of small delay elements combined in a complex way, which are produced by many delay
modules inside the effect unit. In order to obtain smooth and comfortable reverb sounds, it is very important to efficiently
organize the relationship between each delay module and minimize negative mutual interference. The H. D. L. P. is a
technology which applies efficient logarithmic processing to each delay module, so that they can work in the most efficient
way in order to eliminate harmful reverb elements and roughness. This makes it possible to establish high density and
transparent sounds.
*A. S. P. (Fostex Advanced Signal Processing Technology)
The A. S. P. is an exclusive new digital effect processing technology designed by Fostex. This method
extracts maximum efficiency from the limited DSP power. It achieves an overwhelmingly high density
Early Reflection sound and wonderfully smooth High Dump response through the H. F. A. (Harmonic
Feedback Algorithm). Also, it carries out an elaborate reverb simulation with clear sounds through the
H. D. L. P. (Hi-Density Logarithmic Processing), which eliminates the mutual interference between the
numerous integrated delay modules and reduce the impurity and grit of the sound.
Reverb:
The so called Reverb effect consists of various reflection
sounds mixed together. For example, when you clap your
hands in a tunnel, you will hear the sound linger even after
you stop clapping your hands. This is the Reverb. The sounds
we normally hear in daily life have three types of sounds
mixed together, i.e., “Direct sound”, Early Reflection sound”
and “Late Reflection sound”. The Direct sound means the
sound directly reaches the ears from the sound source. The
Early Reflection sound means the sound that comes after
the Direct sound and has rebound off the wall of the tunnel
up to a few times. The Late Reflection sound means that the
sound rebounds many times long after the Direct sound has
disappeared. Our ears normally hear the “Direct sound” -
“Early Reflection sound” - “Late Reflection sound” in that
order.
Delay:
This is the effect to add a delayed sound to the original
sound. You can obtain a richer sound or completely change
the original source sound by using the Delay.
Pitch:
The Pitch basically means the frequency of the audio. But,
in the case of an effect unit, it works this way; for instance,
you can amend the vocal tone by changing the Pitch lifting
or dropping as much as an octave. Also, you can obtain
some unusual effects by mixing the shifted Pitch sound and
the original sound together.
About "A.S.P.+"
Combining the ambience effect technology established through the development of "A.P.S." with acoustic theories accumu-
lated through the development of transducers such as monitor speakers for many years, Fostex developed a unique simula-
tion algorithm engine called "A.S.P.+", which performs overwhelmingly realistic microphone/amplifier simulation.
To simulate a microphone, the frequency response of the microphone, which is the most essential factor that decides the
sound character of each famous/popular microphone, must be reproduced correctly. To get this, "A.P.S.+" carries out a double
accuracy operation for each frequency range using the unique "D.A.O." (Double Accuracy Operation).
Regarding a guitar amplifier, the peak and dip of the specific frequencies, as well as feedback of the peak frequency's harmon-
ics, are the most essential factors that decide the sound character of each famous/popular amplifier. To simulate such a unique
character, "A.P.S.+" carries out a double accuracy operation for each frequency range using the "D.A.O." (Double Accuracy
Operation) to simulate the frequency curve, as well as carries out harmonics feedback processing using the "H.F.A." (Harmon-
ics Feedback Algorithm).
Chorus:
This makes the one original sound appear to have many
sources. The Chorus is used to widen or thicken the origi-
nal sound.
Flanger:
The Flanger is one of applications of the Delay. This is used
to create a sound like a jet airplane ascending or descend-
ing.
Distortion:
The distortion effect distorts the sound and adds harmonics.
Four types of the distortion effect are provided: the guitar
distortion, bass distortion, drum distortion and voice distor-
tion. The distortion is used for the insert effect.
Simulation:
Simulators for famous guitar amplifiers and microphones are
provided. You can get a familiar distortion sound of a famous
guitar amplifier or a popular microphone sound. A simulator
can be used for the insert effect.