Basic Structure
V
oice
Multi
Utility
Ref
erence
The Contr
ols &
Connector
s
Setting Up
Listening to
the Sound
Connections
Using a Computer
Quic
k Guide
Appendix
Tone Generator Block
MOTIF-RACK XS Owner’s Manual
51
Expanded Articulation (XA) is a specially designed tone
generation system used by the MOTIF-RACK XS that provides
greater performance flexibility and acoustic realism. It allows
you to more effectively recreate realistic sound and natural
performance techniques—such as legato and staccato—and
provides other unique modes for random and alternate sound
changes as you play.
Realistic legato performance
Conventional synthesizers recreate a legato effect by continuing
the volume envelope of a previous Note On to the next one, in
the mono mode. However, this results in an unnatural sound
different from that of an actual acoustic instrument. The MOTIF-
RACK XS more accurately reproduces a legato effect by
allowing specific Elements to be sounded when playing legato
and other Elements to be played normally (with the XA Control
parameter settings “normal” and “legato”).
Authentic note release sound
Conventional synthesizers do not adequately reproduce the
special sounds or nuances that occur when a note on an actual
acoustic instrument is released. The MOTIF-RACK XS is
capable of realizing these subtle sonic nuances by setting the
XA Control parameter of a certain Element to “key-off sound.”
Subtle sound variations for each note played
Conventional synthesizers attempt to reproduce this by
randomly changing the pitch and/or filter. However, this
produces an electronic effect and is different from the real sound
changes on an acoustic instrument. The MOTIF-RACK XS more
accurately reproduces these subtle sound variations by using
the XA Control parameter settings, “wave cycle” and “wave
random.”
Switching among different sounds to recreate the
natural performance on an acoustic instrument
Acoustic instruments have their own unique characteristics—
even specific, unique sounds that are produced only at certain
times in a performance. These include the flutter tonguing on a
flute or playing high harmonics on an acoustic guitar. The
MOTIF-RACK XS recreates these by allowing you to switch
between the sounds while you play—setting the A.Func [1]
button and A.Func [2] button on the synchronized MOTIF-RACK
XS Editor to on/off, with the XA Control parameter settings, “AF 1
on,” “AF 2 on” and “all AF off.”
n
The A.Func [1] button and A.Func [2] button can also be set to on/off by
transmitting the Control Change messages assigned to the “A.Func1 Ctrl
No.” and “A.Func2 Ctrl No.” parameters in the Utility Controller window
(page 102) from the external device.
New sounds and new styles of playing
The highly versatile functions above can be applied effectively
not only to acoustic sounds but also to synthesizer and
electronic Voices as well. The XA feature opens up enormous
potential for realizing authentic sounds, performing expressively
and coming up with creative new styles of playing.
To create sounds such as those described above using
Expanded Articulation, refer to page 73.
Elements and Drum Keys are the smallest “building blocks” in
the MOTIF-RACK XS that comprise a Voice; in fact, only one
Element or one Drum Key could be used to create a Voice.
These small sound units can be built, enhanced and processed
by a variety of traditional synthesizer parameters, such as
Oscillator, Pitch Filter, Amplitude, and LFO (shown below).
IMPORTANT
Keep in mind that these Element and Drum Key parameters
can be conveniently and easily edited on the MOTIF-RACK
XS Editor (installed to your computer) instead of the MOTIF-
RACK XS instrument.
Oscillator
This unit outputs the wave which determines the basic pitch. You
can assign the waveform (or basic sound material) to each
Element of a Normal Voice or each Key of a Drum Voice. In the
case of a Normal Voice, you can set the note range for the
Element (the range of notes on the keyboard over which the
Element will sound) as well as the velocity response (the range
of note velocities within which the Element will sound). In
addition, the XA related parameters can be set in this unit.
Oscillator related parameters (pages 73 and 84) can be set on
the MOTIF-RACK XS Editor.
Pitch
This unit controls the pitch of the sound (wave) output from the
Oscillator. In the case of a Normal Voice, you can detune
separate Elements, apply Pitch Scaling and so on. Also, by
setting the PEG (Pitch Envelope Generator), you can control how
the pitch changes over time. Pitch-related parameters (pages
74 and 85) can be set on the MOTIF-RACK XS Editor.
Filter
This unit modifies the tone of the sound output from Pitch by
cutting the output of a specific frequency portion of the sound.
Also, by setting the FEG (Filter Envelope Generator), you can
control how the Cutoff Frequency of the Filter changes over time.
Filter related parameters (pages 76, 77, 78, and 85) can be set
on the MOTIF-RACK XS Editor.
Expanded Articulation (XA)
Elements and Drum Keys
OSC
(Oscillator)
Waveform
(AWM2)
LFO
Low Frequency
Oscillator
PITCH
Controls the
pitch of the
sound.
Pitch EG
(Pitch
Envelope
Generator)
FILTER
Changes the
tonal quality of
the sound
output from the
PITCH unit.
Filter EG
(Filter
Envelope
Generator)
AMP
Controls the out-
put level (ampli-
tude) of the sound
output from the
FILTER unit. The
signals are then
sent at this level to
the Effect block.
Amplitude EG
(Amplitude
Envelope
Generator)
Содержание Motif-Rack XS
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