Manual Yamaha MOTIF-RACK XS (page 51 of 118) (English)

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Basic Structure

Voice

MultiUtility

Reference

The Controls &

Connectors

Setting Up

Listening to

the Sound

Connections

Using a Computer

Quick Guide

Appendix

Tone Generator Block

MOTIF-RACK XS Owner’s Manual

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)

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