Kurzweil KDFX V2 - MUSICIANS REFERENCE REV B Service manual

K DFX V2
M usician’sReference
© Young Chang Co., Ltd. 2002.All rights reserved. Permission is granted to reprint up to two copies of this manual for personal use.
Kurzweil ® is a product line ofYoung Chang Co., Ltd. Young Chang®, Kurzweil ® , V.A. S. T. ®, KDFX®, Pitcher®, and LaserVerb®, KSP8 ™,
K2600™, K2500™, and K2000™ are trademarks of Young Chang Co., Ltd. SmartMedia™ is a trademark of Toshiba Corporation. ADAT® is a
registered trademark of Alesis Corporation. All other products and brand names are trademarks or registered trademarks of their respective
companies. Product features and specifications are subject to change without notice.
Part Number: 910379, Rev. B

ii
Young Chang International Contacts
Contact the nearest Young Chang office listed below to locate your local Young Chang/ Kurzweil representative.
Young Chang America, Inc.
P.O. Box 99995
Lakewood, WA 98499-0995
Tel: [phone]
Fax: [phone]
Young Chang Co., Ltd.
178-55 Gajwa-Dong
Seo-Ku, Inchon, Korea 404-714
Tel: [phone]
Fax: [phone]
Young Chang America, Inc. (Canadian Division)
3650 Victoria Park Ave. Suite 105
Toronto, Ontario Canada M2H 3P7
Tel: [phone]
Fax: [phone]
World WideWeb Home Page
http://www.kurzweilmusicsystems.com

Table of Contents-1
Table of Contents
Young Chang International Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii
Introducing KDFX Version 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Additions and Changes to Effects Mode Pages . . . . . . . . . . . . . . . . . . . . . . 1-2
New Button Presses for Bypassing/Enabling Effects . . . . . . . . . . . . . . . . . 1-2
MAIN Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Soft Buttons in Effects Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Soft Buttons: Configuring Bypasses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Effects Bus Editor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Effects Send Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
The CTRL Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Effects Control Mode (FXCtrl) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Effects Control in Embedded Editors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Bypass and Mute pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Creating a Custom Bypass Scene . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
The EQBYP Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
The FX Bypass Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
The Bus Mute Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Chaining Effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Gain Staging in Effects Chains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
Checking Out Some Chains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
KDFX V2 Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
New FX Algorithms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
Additional FX Algorithms new to K2500 . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
New FX Studios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
Additional FX Studios new to K2500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
New FX Presets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
Additional FX Presets new to K2500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
A Tour of KDFX V2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Load the Tutorial files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
A Simple Studio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
The FXBus Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
The INPUT Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
The FXSEND Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
The AUXFX Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
The OUTPUT Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
A More Complex Studio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
FXBus1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
FXBus2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Table of Contents-2
AuxFX Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Chaining Effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
A Complex Studio with Real-Time Control . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Setting the FXCTRL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
The Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Looking at the Studio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
Setting Up FXMods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
A Note About Effects in Setups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19
Building Your Own . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
Algorithm Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Degen Regen BPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Switch Loops. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Moving Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Allpass Phaser 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
VC+Dist+1Rotor 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
VC+Dist+HiLoRotr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
VC+Tube+Rotor 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Rotor 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
VC+Dist+HiLoRot2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Subtle Distort . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
Quantize+Alias . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23
Pitcher+MiniVerb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-26
Reverb+Compress. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-29
St Chorus+Delay. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-32
St Flange+Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-32
Gate+Cmp[EQ]+Vrb. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-33
Gate+TubeAmp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-37
Revrse LaserVerb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-40
Gated LaserVerb. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-43
Poly Pitcher. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-46
Frequency Offset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-48
MutualFreqOffset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-48
WackedPitchLFO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-52
Chaos! . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-54
Band Compress. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-57
CompressDualTime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-61
3 Band EQ. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-65
HF Stimulate 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-66
HarmonicSuppress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-67

Chapter 1
Introducing KDFX Version 2
Overview
KDFX V2 gives you more control than ever over the effects in each studio, through several
enhancements:
• You can assemble chains of up to four FX Presets on an FXBus.
• You have access to 26 new KDFX algorithms (29 for K2500).
• You can mute or bypass effects and EQ for individual FXBuses. You can now keep effects
bypassed outside the program editor, as well.
• You can get to Effects Mode directly from Program, Setup, and Song modes—you don’t
have to go through another editor first.
If you are familiar with Version 1 of KDFX, you will notice that there are several new pages and
parameters giving you access to the new features. You’ll also notice some changes to existing
pages. The INPUT, AUXFX, and OUTPUT pages have not changed at all with KDFX V2,
however.
The following tables give a brief explanation of the major additions and changes in KDFX V2.
Page Description What’s Different
KDFXMode:MAIN Displays studio assignment.Also, for each insert FXBus, displays FX Preset assignment,
bypass/mute, and PAU assignment.
Was EffectsMode page;controlled studio
assignment, FX Mode and FX Chan, and
dither (noise-floor adjustment).
EditStudio:FXBUS New soft buttons for adding/deleting FX Presets on current FXBus; new soft button
for bringing up the new FXSEND page.
PAU assignment is handled for each FXBus
individually; Level and Balance for each
FXBus are part of new FXSend page;New
feature:you can chain multiple Presets
together on an insert bus using the Add and
Remove buttons.
EditStudio:FXSEND Directs the send of each Insert FXBus to either the default stereo Mix bus or the AuxFX bus,
with balance control for each.
Relocates Lvl and Bal parameters from the
FXBus page.
KDFXMode:CTRL Controls FXCtrl (formerly FX Mode) and
FX Chan, as well as dither. Replaces functionality of EffectsMode page, which no longer exists.
KDFXMode:EQBYP Controls EQ mute/bypass for each Insert
FXBus. New feature.
KDFXMode:FXBYP Controls independent active/bypassed status
for each Insert FXBus and the AuxFX bus. New feature.
KDFXMode:BUSMUT Controls independent active/muted status for
each Insert FXBus and the AuxFX bus. New feature.

1-2
Introducing KDFXVersion 2
Additions and Changes to Effects Mode Pages
Additions and Changes to Effects Mode Pages
Prior to V2, there was a single Effects Mode page, which was responsible primarily for setting
the FX Mode and FX Chan parameters. This pair of parameters affected how the K2600/K2500
selected studios when you changed programs, setups, or songs. You would get to the
EffectsMode page by pressing the Effects button while in a performance mode (not while in an
editor). While inside an editor, the Effects button was used to globally bypass or enable the
effects.
There’s much more going on with V2, so we’ve added several pages, and moved a number of
parameters into more logical groupings. Pressing the Effects button now takes you to the
KDFXMode:MAIN page, which gives you easy access to the Effects Mode pages.
The Studio Editor has some new soft buttons and pages to accommodate effect chaining in
KDFX V2. The Add and Remove buttons on the FXBUS page let you create and modify chains
on the buses. The FX Send and Aux Send fields and graphics that were previously shown on the
FXBUS page are now found on their own new page, FXSEND. Pressing the right more > button
on the FXBUS page reveals the FXSEND soft button, as well as the familiar AUXFX and
OUTPUT buttons.
New Button Presses for Bypassing/Enabling Effects
As a result of the new flexibility we’ve added, bypassing or enabling effects now takes an extra
button press or two, because you have to press Effects , then BypAll or Enable . Also, you may
need to press Exit or Effects again, depending on whether you're just toggling the effects on and
off, or whether you are leaving the effects bypassed and returning to an editor. See page 1-4 for
information on the new bypass features.

Introducing KDFXVersion 2
MAIN Page
1-3
MAIN Page
The KDFXMode:MAIN page gives you a summary view of the current effects configuration,
including the current studio, the FX Presets assigned to each of the five effects buses, and the
bypass status of each bus.
KDFXMode:MAIN||||FXCtrl:Auto||||<>Enable
Studio: 113|PltEnvFI4T|Plate| ||||||Free:0
FX1|||43|Plebe|Chamber||||||||-|||Size:1
FX2|||902|Synth|En |Filter||||B|||Size:2
FX3|||735|Bap|ba_da_dap|||||||-|||Size:1
FX4|||0|None||||||||||||||||||B|||Size:0
Aux|| | 103|Bi g Predel a yPlate | |||B|| | Size:3
MAIN| | CT L|| | EQBYP| | FXBYP| | BUSMUT | Enable |
Figure 1-1 Effects mode: the KDFXMode:MAIN page
As with every other page, the top line of the KDFXMode:MAIN page identifies the page you’re
on. It also shows you two other important features of Effects mode:
FXCtrl: Effects-control status. Prior to V2, this was called FX Mode. The functionality
hasn’t changed, but we renamed it because it’s now a parameter on the Ctrl page,
which is accessible with the CTRL soft button.
Enable state: Shows whether KDFX is currently enabled or if any part of KDFX is bypassed or
muted.
The second line of the display shows the ID and name of the current studio. When you enter
KDFX Mode directly (i.e., not through another one of the K2500/K2600’s editors) you can scroll
through the displayed list of studios. This allows you to choose a different studio on the
KDFXMode:MAIN page. When FXCTRL is set to Master (see page 1-7), you can also do this,
even when you have entered KDFX Mode from within another editor.
If you select the studio then press the Edit button, you’ll go to EditStudio:FXBUS page, where
you can make changes to each bus within the studio.
The second line also shows the number of PAUs available for the current studio (“Free:” on the
right-hand side). This number will be 0–4, since in each studio four PAUs are available for the
four insert FXBuses (the AuxFX bus has its own fixed set of three PAUs).
The next five lines show the IDs and names of the FX Presets assigned to the five effects buses
(insert FXBuses 1–4 and the AuxFX bus). You can’t change these assignments on the
KDFXMode:MAIN page; to do that you would highlight the Studio name (line two of this page)
then press Edit . This takes you to the Studio Editor, on the appropriate FXBUS page for the first
bus. As in KDFX V1, use the Chan/Bank buttons to move between buses.
Each of these five lines also indicates the bypass status for the five buses, as well as the number
of PAUs used by each FXBus. A dash (
-
) indicates active/enabled, and
B
indicates
bypassed/disabled. You can change the bypass status for a bus by moving the cursor to this
field and changing it with either the alpha wheel or pressing one of the increment/decrement
buttons.
The size of each FX Preset is measured in PAUs (processor allocation units). FXBuses 1–4 can all
use up to four PAUs, but the studio can use a maximum of four total PAUs. The AuxFX bus can
use up to three PAUs independent of the insert FXBuses.

1-4
Introducing KDFXVersion 2
MAIN Page
Soft Buttons in Effects Mode
The MAIN button takes you to the KDFXMode:MAIN page, where you can view the current
studio and the FX Presets assigned to the five KDFX buses.
The CTRL button takes you to the KDFXMode:CTRL page, which contains parameters that
determine which studio gets selected when you select a program, setup, or song. You also use
the KDFXMode:CTRL page to change dither and digital word size settings.
Soft Buttons: Configuring Bypasses
You can individually bypass any of the EQ and effects inputs, and also mute any of the FXBuses
(the four insert FXBuses and theAuxFX bus). In the enabled state, nothing is muted or bypassed.
The K2600/K2500 always starts up in the enabled state.
Use these soft buttons to perform bypasses and muting:
EQBYP Displays EQ Bypass page, where you can bypass the EQ on each individual
input bus.
FXBYP Displays FX Bypass page, where you can bypass the effects on individual
FXBuses.
BUSMUT Displays the BusMute page, where you can mute the output of individual
FXBuses.
BypAll/Enable Toggles between enabled state and default bypass state (all buses bypassed,
none muted). If you have created a custom bypass scene, BypAll resets it to
the default bypass state. See page 1-8 for information on creating a custom
bypass scene.
You may also use either of the Chan/Bank buttons to toggle between enabled
and bypassed states. This will often be preferable, since Chan/Bank, unlike
BypAll, does not reset the bypass state to the default (all buses bypassed,
none muted). Instead, Chan/Bank toggles between the enabled state and any
custom bypass scene you may have created, allowing you to audition a studio
with and without bypasses.

Introducing KDFXVersion 2
Effects Bus Editor
1-5
Effects Bus Editor
The revised FXBus Editor lets you create effects Preset chains on any of the four stereo effects
buses. See page 1-11 for more information about chaining effects.
EditStudio:FXBUS|Size:3|Free:0|<>FXBus:1
|||||qWWWWT|||||||||||||||||||||||||||||
FX1|!k vrb©!!!!!!!!!!!!!!!!!!!!!!!!!!!h|
|||||CVVVVB|||||||||||||||||||||||||||||
FX:|1|NiceLittleBooth|||||||||||||||||||
Wet/Dry|||:42%wet|||||||||||||||||||||||
Out|Gain||:0.0dB|||||||||||Alloc:Auto|||
<more||INPUT||FXBUS|||Add||emove||more>
Figure 1-2 Effects Bus Editor display -- single effect
EditStudio:FXBUS|Size:1|Free:0|<>FXBus:1
|||||qWWWWT|||qwwwwt|||qwwwwt|||qwwwwt||
FX1|!k vrb©!!!kChorg!!!kDly|g!!!kFlngg!h
|||||CVVVVB|||CVVVVB|||CVVVVB|||CVVVVB||
FX:|1|NiceLittleBooth|||||||||||||||||||
Wet/Dry|||:42%wet|||||||||||||||||||||||
Out|Gain||:0.0dB|||||||||||Alloc:Auto|||
<more||INPUT||FXBUS|||Add||emove||more>
Figure 1-3 Effects Bus Editor display -- four chained effects
The Add and Remove buttons allow you to define your own chains of effects using up to four
FX Presets. The Add button creates an effects block (shown as a box) to the right of the current
cursor position in the effects chain. You can use a total of four effects in any studio, so if you
create a four-block effects chain on a bus then you won’t be able to use any effects on the other
buses in that studio. Your K2500/K2600 keeps track of effects usage for you, and won’t let you
add an effects block to a bus if you’re already max’ed out.
The Remove button deletes the effects block that the FXBUS editor cursor is on. Adding and
deleting effects blocks may cause audio glitches in any signal path and should not be done
during critical listening.
Each FX Preset in an effect chain has two “override” parameters (BusMods) that are displayed
when that FX block is selected. By selecting the name of an override parameter (e.g., Wet/Dry),
you can scroll to choose from any other available parameter.
Each effect also has its full complement of real time modulators as defined and displayed in the
Program and Setup editors.

1-6
Introducing KDFXVersion 2
Effects Send Page
Effects Send Page
The FXSEND page lets you send the output of each stereo effects bus to the stereo mixdown and
auxiliary buses.
In KDFX V1, these sends were on the EditStudio:FXBUS page.
EditStudio:FXSEND|||||||||||||<>FXBus:1|
|||||!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!h
||||||0wwwwt||||||||||0wwwwt|||||||||
||||||KAux|1||||||||||KMix|1|||||||||
||||||CVVVVB||||||||||CVVVVB|||||||||
|||||||Aux|L l:0.0dB|||Mix|L l:0.0dB||||
|||||||Aux|Pan:0%||||||Mix|Pan:0%|||||||
||||||||||||||||||||||||||||||||||||||||
<more||FXSEND|AUXFX|OUTPUT|||||||||more>
Figure 1-4 Effects Bus Send display