Korg PX4A User Manual

Precautions

Location

Using the unit in the following locations can result in a malfunction.

• In direct sunlight Locations of extreme temperature or humidity

•

• Excessively dusty or dirty locations

• Locations of excessive vibration

• Close to magnetic fields

Power supply

Please connect the designated AC adapter to an AC outlet of the correct voltage. Do not connect it to an AC outlet of voltage other than that for which your unit is intended.

Interference with other electrical devices

Radios and televisions placed nearby may experience reception interference. Operate this unit at a suitable distance from radios and televisions.

Handling

To avoid breakage, do not apply excessive force to the switches or controls.

Care

If the exterior becomes dirty, wipe it with a clean, dry cloth. Do not use liquid cleaners such as benzene or thinner, or cleaning compounds or flammable polishes.

Keep this manual

After reading this manual, please keep it for later reference.

Keeping foreign matter out of your equipment

Never set any container with liquid in it near this equipment. If liquid gets into the equipment, it could cause a breakdown, fire, or electrical shock. Be careful not to let metal objects get into the equipment. If something does slip into the equipment, unplug the AC adapter from the wall outlet. Then contact your nearest Korg dealer or the store where the equipment was purchased.

CE mark for European Harmonized Standards

CE mark which is attached to our company’s products of AC mains operated apparatus until December 31, 1996 means it conforms to EMC Directive (89/336/EEC) and CE mark Directive (93/68/EEC). And, CE mark which is attached after January 1, 1997 means it conforms to EMC Directive (89/336/ EEC), CE mark Directive (93/68/EEC) and Low Voltage Directive (73/23/EEC). Also, CE mark which is attached to our company’s products of Battery operated apparatus means it conforms to EMC Directive (89/336/EEC) and CE mark Directive (93/68/EEC).

THE FCC REGULATION WARNING (for U.S.A)

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.

•Increase the separation between the equipment and receiver.

•

Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

• Consult the dealer or an experienced radio/TV technician for help.

Unauthorized changes or modification to this system can void the user’s authority to operate this equipment.

Introduction ............................. 6

Main features........................... 6

Installing the batteries .............. 8

Battery Low display ........................ 8

Using the strap holder .............. 8

Controls and connectors ........... 9

LCD screen ................................... 11

Making connections ............... 12

Initial Settings ........................ 13

Quick Edit .................................... 13

Play mode ............................. 14

1. Selecting a program ................. 14

2. Master level ............................. 14

3. Bypass/Mute ............................ 14

4. Tuner ........................................ 15

5. Specifying the function of the Value

Dial .......................................... 16

6. Key Lock function ..................... 17

Rhythm & Bass mode ............. 17

1. Rhythm Pattern ......................... 18

2. Tempo ...................................... 18

3. Bass On/Off & Bass Key .......... 18

4. Rhythm & Bass Reverb Level ..... 19

5. Rhythm & Bass Level................. 19

6. Chain Pattern settings ............... 19

AUX Pitch mode ..................... 20

Phrase Trainer mode .............. 21

1. Select the recording mode ........ 21

2. Recording ................................. 22

3. Playback .................................. 23

4. Pause ....................................... 23

NOTCH effect and Auto Notch

function ................................. 24

Edit mode .............................. 25

Select the effect that you wish to edit

................................................ 25

2. Editing each effect .................... 25

1) DYNA (Dynamic effects) ........ 26

2) TONE (T one Controls)............ 26

3) BODY (Mic & body modeling) 26

4) MOD (Modulation & Filter Effect

Modeling) ............................... 26

5) DLY (Delay Modeling) ............ 27

6) REV (Reverb Modeling) ......... 27

7) NR (Noise reduction) ............. 27

8) NOTCH (Notch effect)............ 27

9) RENAME................................ 28

10) WRITE ................................. 28

3. Reloading the factory programs

................................................ 29

Troubleshooting...................... 29

Effect Parameter ..................... 31

DYNA (Dynamic effects) ................ 31

TONE ........................................... 31

BODY (Mic & Body Modeling) ....... 32

MOD (Modulation & Filter Effect

Modeling) ..................................... 33

DLY (Delay Modeling) ................... 35

REV (Reverb Modeling) ................. 36

Preset Program Name ............ 37

Rhythm Pattern List ................. 38

Specifications ......................... 40

Introduction

Thank you for purchasing the TONEWORKS PANDORA PX4A acoustic per sonal multi-effect processor. In order to enjoy your PANDORA PX4A, please read this owner’s manual

carefully and hold on to it for future reference.

Main features

The PX4A is a highly versatile compact multieffect unit designed for acoustic guitar . It makes

it easy to use Korg’s proprietary “ eling technology to create detailed and power-

ful modeling sounds.

82 types of effect variations with a maximum of eight effects that can be used simultaneously.

IPE (Integrated Parameter Edit) system allows

easy editing of the effect settings.

50 user and 50 preset programs

” mod-

Mic & body model selector

A selector dial lets you quickly and easily edit 11 of the 13 types of mic and body model.

Control knobs

Control knobs make it easy to adjust the threeband equalizer and the volume level. You can adjust the tone and volume even while you're performing.

Notch effect and Auto Notch function

The PX4A provides a Notch effect that's effective against acoustic feedback. You can quickly set the notch point by using the NOTCH button and the Value dial. Alternatively, you can use the Auto Notch function to set the notch point automatically.

Backlit LCD

The LCD screen can be easily viewed even in dark locations.

Auto Tuner function

This feature makes tuning fast and easy. You can also tune “silently” (i.e., while muted).

Rhythm and Bass function

100 types of rhythm and bass patterns or a metronome can be used. 16 multiple patterns can also be connected for successive playback.

AUX pitch function

You can transpose the pitch of the sound from a CD player or other audio source connected to the AUX jack of the PX4A.

Phrase Trainer function

Audio from an external audio source or guitar can be recorded (maximum of 31.7 seconds), and then played back as a loop. Since you can slow down the playback speed without affecting the pitch, this function provides a very convenient way to practice phrases from a recording. In addition, you can use Rhythm & Bass mode to generate a rhythm pattern and record it at the same time.

TAP button

You can easily set the Delay Time or the tempo of the Rhythm & Bass function to match the tempo of the song.

Value dial

This lets you rapidly select programs or edit the effects.

What is

(Resonant structure and Electronic circuit Modeling System) is KORG’s proprietary sound modeling technology which precisely reproduces the complex character and nature of both acoustic and electric instruments as well as electronic circuits in real world environments. variety of sound generation characteristics including instrument bodies, speakers & cabinets, acoustic fields, microphones, vacuum tubes, transistors, etc.

emulates a wide

Installing the batteries

Remove the battery cover located on the bottom of the PX4A by sliding it in the direction of the arrow. Insert four AAA alkaline batteries as shown in the illustration. Be sure to insert the batteries observing the correct polarity.

Battery Low display

When the batteries begin to run low, the Low Battery icon replace the batteries as soon as possible. Programs and other data (except for the data being edited) will not be lost even if the battery is removed and changed.

Batteries that have run down must be removed from the PX4A. If you leave dead batteries in the unit, malfunctions (battery leakage, etc.) may occur. You should also remove the batteries when you do not expect to use the PX4A for an extended period of time.

will light. When this icon lights,

An AC adapter is not included with this product. It must be purchased separately.

Using the strap holder

Pass your strap through the strap holder.

2. Slide the protrusion (A) of the strap holder into the attachment slot (B) on the rear of the

PX4A.

3. Press in the direction of the arrow (a) until locking tab (c) clicks into place.

4. Shake the PX4A lightly to ensure a secure fit.

Removal

1. Press the strap holder locking tab (c) in the direction of arrow (b) to release the lock.

2. With the lock released, slide the PX4A in the opposite direction from when attaching it, and remove it from the holder.

Controls and connectors

1 2

3 4

5 6

7 8

18 17 16

15 14

9101112

1. Control knobs

These knobs control the tone and volume.

2. LCD (Liquid Crystal Display)

3. TUNE/BYPASS button

4. EXIT button

This button returns you back to Play mode from any mode.

5. ENTER/REC button

This button is used to switch an effect on/off , or to start recording in Phrase Trainer mode.

6. Input level switch

Use this to adjust the input level depending on the output level of your guitar.

7. Mic & body model selector

Use this to select the desired type of mic & body model.

8. ▲/▼ buttons

Use these buttons to select programs and edit effects.

9. OUTPUT jack

Connect this jack to your guitar amp, bass amp, or headphones etc.

10. INPUT jack

Connect your guitar or bass to this jack.

11. AUX jack (stereo)

Connect this jack to a CD player or other audio source.

12. DC4.5V

The separately sold AC adapter (DC4.5V should be connected here.

13. √/® buttons

Use these buttons to select the parameter that you wish to edit, and to operate the Phrase Trainer function.

14. Power switch/Backlight switch

This switch turns the power on/off, and also turns the backlight on/off.

If you are operating the PX4A on batteries, the operating time will be shorter if the backlight is on.

15. Value dial

Use this to adjust the master level, edit effects, and select programs.

16. TAP button

Use this button to set the delay time or the tempo in Rhythm & Bass mode.

17. NOTCH button

This button turns the Notch effect on and the Notch effect editing page will appear.

)

18. Mode buttons

Use these buttons to enter Rhythm & Bass, AUX Pitch, or Phrase Trainer modes.

LCD screen

def

a. Effect chain This area indicates the on/off status of the DYNA, TONE, BODY, MOD, DLY, and REV effects.

b. Program name/Effect type display

This area shows the program name or effect type. When the PX4A is bypassed or muted, this will function as the tuner.

c. Low Battery icon

This icon will light when the batteries run low.

d. Mode icons

These icons will light when you are in AUX Pitch, Phrase Trainer, or Rhythm & Bass modes.

e. EDIT icon, ORIG (Original) icon,

NOTCH icon

The EDIT icon will light when you enter Edit mode , and the ORIG (Original) icon will light if the parameter you're editing is set to the same value as the value written in the program. The NOTCH icon will light when the Notch effect is on.

f. Program number / value display

This displays the program number. When you change the Master Level, its value will be displayed here for several seconds. During editing, this displays the parameter values.

g. Master/Value icons, bar graph

When MASTER is lit, the master level of the program is indicated graphically. When VALUE is lit, the value of the parameter is indicated graphically.

Making connections

When connecting an external device (ie-guitar amp, CD player, ac adapter, etc) be sure to turn the unit off.

mini-component / stereo etc.

guitar amp /

powered monitor

headphone *5

guitar

AC adapter *1

CD player etc.*2

*1 Be sure to use only the specified AC adapt-

er (DC4.5V ).

*2 If a CD player or other audio source is con-

nected to the AUX jack, you can play along to it with your guitar. However the volume

must be adjusted from the connected device. *3 Connecting cables are sold separately. *4 The PX4A’s output jack is stereo. If you use

a standard mono cable to connect it to a gui-

tar amp etc., only the L (left) output will be

heard. *5 The PX4A’s output level and sound quality

will vary depending on which headphones

are used. We recommend using good quali-

ty low impedance headphones, 32 Ohms or

less with a sensitivity rating near 100dB/mW

or above. Many headphones sold f or use with

portable CD or cassette players will work just

fine.

Initial Settings

Program selection

Program name

Input level switch

Mic & Body selection

Adjust the tone, and volume

Program number

Set the delay time

Master level adjustment

1. When you finish making connections, set the power switch to the “ON” position. (This setting is referred to as Play mode.) Use the ▲/▼ buttons to select a program.

2. Set the input level switch for the output level of your pickups.

Hi: High-output pickups Lo: Low-output pickups

3. Set the volume control of your guitar to its usual position. Use the Value dial to adjust the master level.

Quick Edit

In each mode (except when Mute/Bypass or Ke y Lock are active), you can use the Mic & Body Modeling selector to quickly change the mic or body modeling type, or use the control knobs to adjust the tone, or volume. When you move a control knob, the parameter name and value will appear for sever al seconds in the value display. If the setting matches the original setting, the ORIG icon will light.

The Delay Time can also be set by pressing the TAP button twice at the desired interval (ex- cept when in Rhythm & Bass mode). To check the Delay Time that was specified, press and hold the TAP button for two seconds or longer.

Settings that you make using Quick Edit will return to the original saved settings if you change programs or turn off the power before Writing (see p.28).

Play mode

Master level value

Program number display

Master icon

Value graph

Play mode is the mode in which you will normally use the PX4A.

1. Selecting a program

You can choose from 50 user programs (U01...U50) and 50 preset programs (P01...P50). Use the ▲/▼ buttons to select a program. Programs can be selected even when you are in Rhythm & Bass mode, AUX Pitch mode, or Phrase Trainer mode (except while recording).

2. Master level

When the MASTER icon is lit, the value graph will indicate the master level. When you turn the Value dial to adjust the master level, the master level value will be shown in the program number / value display for several seconds. The master level is remembered even when the power is turned off.

You can also adjust the settings so that the ▲/▼ buttons will adjust the master level. (See p.16)

3. Bypass/Mute

When you press the TUNE/BYP ASS button, the PX4A will be bypassed, and the original sound

will be dry (no effect). The effect chain will blink, and the display will indicate “BYPASS” for approximately one second.

If you press and hold the TUNE/BYP ASS b utton for longer than one second, the output signal will be muted. the display will indicate “MUTE” for approximately one second. Bypass/mute will be turned off when you press the TUNE/BYPASS button once again.

The effect chain will blink rapidly, and

You can also return to Play mode by pressing the EXIT button. Bypass or Mute can also be entered from modes other than Play mode.

4. Tuner

The tuner will operate when you bypass or mute.

meter

sharp note name calibration

center mark

Play a single string on your guitar. The LCD will show the note name and the calibration. If the pitch is more than a semitone higher than the note name, a sharp symbol will appear at the upper right of the note name. The display area will act as a meter to show the pitch. Tune each string of your guitar so that the indicator above the center mark is lit.

The tuner (bypass/mute) will be turned off when you press either the EXIT button or TUNE/BY- PASS button. You can also return to Play mode by pressing the EXIT button.

Calibration (frequency of the standard A = 440 pitch)

You can use the Value dial to adjust the calibration in the range of A = 438 Hz...445 Hz. The calibration setting you make will be v alid until the power is turned off. Once the power is turned off, the calibration will be reset to A = 440 Hz.

5. Specifying the function of the Value

Select a program

Adjust the master level

Dial

You can specify the function that the Value dial will perform in Play mode. In Play mode, hold down the EXIT button and press either the √ button or the ® button to assign the following functions.

● Hold down the EXIT button and press the √ button.

The LCD will indicate “MASTER” for approximately one second. The Value dial will and the ▲/▼ buttons will Each time the power is turned on, this setting will be in effect.

adjust the master level,

select programs.

Adjust the master level

Select a program

● Hold down the EXIT button and press the ® button.

The LCD will indicate “PROGRAM” for approximately one second. The Value dial will ▲/▼ buttons will

select programs, and the

adjust the master level.

If you want to change the function of the Val- ue dial so that it will

adjust the master level, again,hold down the EXIT button once and press the √ button, or turn on the power.

6. Key Lock function

By activating the Key Lock function, you can disable all operations except for selecting programs. This is a convenient way to prevent accidental operation during a live performance. Hold down the EXIT button and press the TUNE/BYPASS button. The LCD will indicate “KEYLOCK” for approximately one second. The ▲/▼ buttons will select programs, and the other buttons and Value dial will not function.

Only program selection is possible

The Key Lock function will be cancelled when the power is turned off. You can also cancel the Key Lock function by perf orming “5. Specifying the function of the Value Dial.” (☞p.16).

Rhythm & Bass mode

To enter Rhythm & Bass mode, press the RHYTHM/AUX PITCH button once when in Play mode (except if Mute, Bypass, or Key-Lock is active), AUX Pitch mode, or Phrase Trainer mode.

When you enter this mode, the Rhythm Pattern selection screen will appear, the selected rhythm will start, and the Rhythm & Bass mode icon will light. The indication of the value graph will change according to the pattern or tempo.

This mode contains the following five parameters. Use √/® to select parameters, and use the Value dial and the ENTER/REC button to set the value of each parameter. If you select “CHAIN” as the rhythm pattern, there will be more chain pattern settings. (Refer to p.19, “Chain pattern settings”)

Rhythm pattern

Additional settings when rhythm pattern is “CHAIN”

Chain pattern setting

Tempo

Rhythm &

Bass

level

Bass On/Off and Bass Key

Rhythm &

Bass

reverb level

If you select “JAM” as the recording mode in Phrase Trainer mode, the rhythm will sound with the pattern and tempo that you specify here.

The settings you select here are remembered even when the power is turned off.

1. Rhythm Pattern

Use the Value dial to select the rhythm pattern (p.38)

Rhythm Pattern

Rhythm & Bass mode icon

2. Tempo

Set the tempo in the range of 40–208 bpm. You can also set the tempo by pressing the TAP button twice at the desired rhythm. For a 6/8 time signature, the tempo can be set in a range of   =40–208.

tempo display

3. Bass On/Off & Bass Key

Here you can switch the bass on/off, and specify the key in which the bass will play.

key display

If you press the ENTER/REC button in this screen, the bass will play in time with the rhythm. Depending on the rhythm pattern that you have selected, some bass lines will include a chord

progression. When the bass note is on, you can use the Value dial to set the key in a range of C, C...A, B, allowing you to practice your guitar in a scale that matches that key.

If “METRONM” – “METRO7”(metronome) is selected as the rhythm pattern, there will be no bass notes, and this screen will not appear.

When using Chain Patterns, the Bass Key setting will be ignored.

4. Rhythm & Bass Reverb Level

Use the Value dial to set the amount of Reverb for the Rhythm & Bass.

Reverb level

This uses the same reverb as the program effect. This parameter has no effect if you have selected a program that does not use reverb modeling, or if the reverb effect level is “0.”

5. Rhythm & Bass Level

Use the Value dial to set the level of the Rhythm & Bass sound. The bass note will be affected only if Bass is turned on.

Rhythm & Bass level

6. Chain Pattern settings

These parameters are added only if you select “CHAIN” as the rhythm pattern. Press the EN- TER/REC button to access the Chain Parameter Select screen. Use the √/® buttons to select the location (1...16) for which you want to change the pattern, and use the Value dial to select the pattern (p.38) that will be used at that location. Use the ▲/▼ buttons to specify the bass key of the selected pattern.

Pattern location

Display of 10 cent units

Display of 100 cent units

Up to 16 patterns can be chained (connected). If you want to create a chain of 15 or fewer patterns, select “PTN END” for the last pattern. Press the ENTER/REC button to exit the Chain Pattern Select screen.

If you change the pattern location by turning the value dial while holding down the button, the pattern at which you were located will be copied to the destination pattern location. This function is con venient when y ou want to place the same pattern again.

AUX Pitch mode

In this mode you can transpose the pitch of a CD or other audio source connected to the AUX jac k. To enter AUX Pitch mode, press the RHYTHM/ AUX PITCH button twice when in Play mode (except if Mute, Bypass, or Key-Lock is active)

√

or Phrase Trainer mode. When you are in this mode, the AUX Pitch icon will light. Use the Value dial to specify the amount of key transposition. The key can be transposed in a

Key

range of +/-1 octave. The value can be adjusted upward and downward for 3 semitones in 10 cent steps, and in semitone steps (100 cents) for the remainder of the range.

Press the EXIT button to return to Play mode.

The output will be mono in AUX Pitch mode. The AUX Pitch setting is remembered even

when the power is turned off.

Phrase Trainer mode

Recording mode

Phrase Trainer icon

Recording time

An audio source from the AUX jack or a phrase you play on your guitar can be recorded, and played back repeatedly as a loop. This provides a convenient way to practice by playing along with the repeating phrase. You can slow down the playback speed without affecting the pitch, which can help you to learn difficult phrases. If you select “JAM” as the recording mode, the rhythm you specified in Rhythm & Bass mode will be recorded simultaneously with the guitar input, and looped.

1. Select the recording mode

In Play mode (except during bypass/mute or k ey lock), Rhythm & Bass mode, or A UX Pitch mode, press the PHRASE TRAINER button to enter Phrase Trainer mode. When you enter this mode, the recording mode and time select screen will appear, and the Phrase Trainer icon will blink. In this screen, the PX4A will be ready to record.

The recording mode will cycle through the following choices each time you press the

PHRASE TRAINER button.

AUX Records only the AUX input GUITAR Records only the guitar AUX+GTR Records both the AUX input and

JAM

Use the value dial to select the recording time (for “JAM,” the number of measures).

8 Approximately 7.9 seconds 16 Approximately 15.8 seconds 32 Approximately 31.7 seconds 1, 2, 3… Number of measures

guitar Records the guitar together with the rhythm that was last selected in Rhythm & Bass mode

If the recording mode is “JAM,” the recording

Recording time display

quality will be set automatically , based on the tempo and the specified number of measures.

If you select a long recording time (16 or 32), the audio quality of the recording will be lower.

If the tempo of the rhythm is extremely slow, it will not be possible to record a large number of measures. Please re-specify the tempo in Rhythm & Bass mode (maximum length is approximately 31.7 seconds)

Start playback on your CD or other audio source, and at the point where you wish to begin recording, press the ENTER/REC button. Recording will begin.

If the recording mode is “JAM,” recording will begin after the precount.

If, after recording, you want to change the recording mode or recording time, press the PHRASE TRAINER button while playback is paused.

The recorded content will be lost when the power is turned off.

2. Recording

When you begin recording, the recording time will be indicated as a numerical value and by a value graph.

When you want to stop recording, press the EN- TER/REC button or the [®❙❙]. Recording will stop, and loop playback will begin automatically. If you do not stop recording, recording will continue until the selected recording time has elapsed, and loop playback will begin automatically. If the recording mode is “JAM,” recording will end automatically at the specified number of measures, and will switch to loop playback.

The phrase will be recorded and played back in mono.

3. Playback

The recorded phrase will playback as a loop.

playback time display

playback speed(%)

Rotating the Value dial toward the left will slow down the playback speed without affecting the pitch. You can choose from six levels of playback speed: 100%, 90%, 80%, 75%, 66%, and 50%. During playback, you can press the [√√] but- ton to rewind.

By pressing the PHRASE TRAINER button, you can hold the sound that was being played at the moment you pressed the button (the Hold function). This is convenient when you need to hear individual notes in a phrase. During playback or while paused, you can use the ▲/▼ buttons to select programs.

4. Pause

When you press the [®❙❙] button, the playback will pause. Press the [®❙❙] button once again, and playback will resume. Pressing the [√√] button while playback is paused will return you to the beginning of the recorded phrase.

If you wish to re-record the phrase, press the [®❙❙] button to pause playback.

Start the CD or other audio source, and press the ENTER/REC button at the beginning of the desired phrase. If you want to change the recording mode or time, press the PHRASE TRAINER button while paused.

NOTCH effect and Auto Notch function

When you press the NOTCH b utton, the Notch effect will be automatically turned on, and the Notch effect edit page will appear. Use the ENTER/REC button to turn the Notch effect on/off, and use the value dial to specify the notch point that minimizes the acoustic feedback. Alternatively, if you press the NOTCH but- ton again, while the Notch effect edit page is displayed, the LCD will indicate “ATNOTCH” for one second, and the Auto Notch function will find and set the notch point automatically.

In some situations, such as when there’s no sound or if acoustic feedback is occurring while you’re playing a chord, the Auto Notch function may be unable to find the appropriate notch point.

The Auto Notch function may not find the appropriate notch point on the first try. If so , press the NOTCH button again, and tr y several times if necessary.

If you’ re in a mode other than Edit mode (p .25) and you press the NOTCH button to move to the notch effect edit page, you won’t be able to use the pages for other effects.

We recommend that you leave the Notch effect turned off unless you’re having problems with acoustic feedback.

√

/ ® buttons to move to the edit

Edit mode

In this mode you can turn each effect on/off, and edit the effect type, parameter values, and program name. In Play mode, press the √ (or ® ) button to access the DYNA effect edit screen. In any screen of Edit mode, you can use the control knobs to edit the tone and lev el, or use the TAP button to set the delay time. Press the EXIT button to return to Play mode. If a program was not written after it was edited, the decimal point of the program number will light.

The edited settings will return to the settings

of the original program if you switch programs or turn off the power without Writing (see p.28).

Before writing

After writing

1. Select the effect that you wish to edit

Each time you press the √/® buttons, you will cycle through the effects in the order shown below. When an eff ect is selected, its icon will blink.

2. Editing each effect

For each effect, you can select the effect type and set its parameter values.

Effects that are turned “OFF” will automatically be turned “ON” if you press the ENTER/REC but- ton or use the ▲/▼ buttons to select the effect type. For details on the effect types and parameters, refer to Effect Par ameters (p.31). Renaming the program and writing the program are also performed here.

1) DYNA

Parameter value

Type selection

On, Off

Parameter value

Type selection

(Dynamic effects)

These are dynamic-type effects such as compressor.

On, Off

Type selection

2) TONE (Tone Controls)

This is a three-band tone control.

Low range

High rangeMid range

On, Off

The VOLUME control knob can be used to ad- just the volume even when the TONE is “OFF.”

Parameter value

Volume

Mid range frequency

3) BODY (Mic & body modeling)

This is a modeling effect that simulates a condenser mic and acoustic guitar bodies. Use the value dial to adjust the depth of the effect.

4) MOD (Modulation & Filter Effect

Modeling)

These are modulation and filter-type effects such as chorus, 12 string simulator, flanger , and pitch shifter.

5) DLY (Delay Modeling)

Adjust the depth of noise reduction

These are delay type effects for which you can set the delay time by the interval at which you press the TAP button.

Delay

On, Off

time Effect

level

Type selection

6) REV (Reverb Modeling)

These are reverb type effects that add spaciousness to the sound.

On, Off

Effect level

Type selection

7) NR (Noise reduction)

Use the Value dial to adjust the depth of the noise reduction.

Increasing this value will produce more noise reduction. Normally you will adjust this so that you do not hear obtrusive noise when the strings are lightly muted.

If the NR value is raised excessively, the sound may be cut off prematurely. If this occurs, reduce the value.

Adjust the NR level as suitable for your guitar, or pickup.

8) NOTCH (Notch effect)

This effect is a notch filter that minimizes acoustic feedback. Use the value dial to select the notch point at which the acoustic feedback is least. The notch point will mo ve toward a higher frequency as you turn the value knob toward the right.

On,

Program number that currently occupies the writing destination

Write

Select a user program

number as the writing

destination

Off

you can press the NOTCH button to move to the edit page for the Notch effect. (For details, refer to p.24.)

We recommend that you leave the Notch effect turned off unless you’re having problems with acoustic feedback.

9) RENAME

Here you can specify a name for each program. The following characters can be used: space, 0–9, A–Z, “, ‘, ❋, +, -, /.

Notch point

Select the character

Select the character location

10) WRITE

Here you can write (store) a program that you created. Use the Value dial to select the writing destination (User programs only). When you do so, the name of the program that currently occupies the writing destination will be displayed briefly. If you decide not to write, press the √ (or ®) button to select a different screen. When you press the ENTER/REC button, the edited program will be written into memory. When the program has been written, the LCD will indicate “COMPLT” for approximately one second.

Before writing an edited program into a different program number, be sure that you do not mind overwriting the data that is currently in that program number. The program data that is overwritten will be lost.

It is not possible to write to a preset program.

3. Reloading the factory programs

While holding down the RHYTHM/AUX PITCH button and the ▲ button, turn on the power.

The LCD will ask “RELOAD?” If you press the ENTER/REC button, the factory-set programs will be re-loaded into the user program area. The display will indicate “RE- LOAD”, “VERIFY”, “COMPLT” for a short time, and then the power-on screen will appear.

Never turn off the power during the reload operation.

If you decide not to reload, press the EXIT but- ton while the “RELOAD?” indication is still shown. The power-on screen will appear (without reloading), and then you will enter Play mode.

Be aware that if you reload the factory programs, the user programs and any settings that are remembered when the power is turned off (master level etc.) will all be overwritten.

Troubleshooting

If the PX4A does not operate as you expect, please check the following points first. If this does not resolve the problem, contact your dealer.

1.Power does not turn on.

• Are batteries installed? Is the correct polarity observed? Alternatively , is the correct AC adapter connected to an AC outlet?

2.No sound

• Are your guitar, amp or headphones connected to the correct jacks?

• Is your amp turned on and set correctly?

• Are any cables broken?

• Is the master level of the PX4A set to “0” or to a low level?

• The VOLUME control knob may have been turned down.

• Is the PX4A muted? Take note that if all effects are off, the chain display will disappear, and it will not be possible to distinguish Bypass or Mute from the LCD display.

• Is the volume of your guitar turned down?

3.The volume from the device connected to the AUX jack is too loud or too soft, or cannot be heard.

• Adjust the output level of the connected device.

• Make connections to the headphone jack of the device, instead of to its line output.

• Are you in Phrase Trainer mode? Exit Phrase Trainer mode.

• Are you using a connection cable with a builtin resistor?

4.Effects cannot be heard

• Is the PX4A bypassed? (the effect chain will be blinking)

• Are the effects used in the program turned on?

5.Tuner does not work.

• Is the PX4A bypassed or muted?

+ 91 hidden pages

Korg PX4A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

Introduction

Main features

Installing the batteries

Battery Low display

Using the strap holder

Controls and connectors

LCD screen

Making connections

Initial Settings

Quick Edit

Play mode

1. Selecting a program

2. Master level

3. Bypass/Mute

4. Tuner

6. Key Lock function

Rhythm & Bass mode

1. Rhythm Pattern

2. Tempo

3. Bass On/Off & Bass Key

4. Rhythm & Bass Reverb Level

5. Rhythm & Bass Level

6. Chain Pattern settings

AUX Pitch mode

Phrase Trainer mode

1. Select the recording mode

2. Recording

3. Playback

4. Pause

NOTCH effect and Auto Notch function

Edit mode

1. Select the effect that you wish to edit

2. Editing each effect

2) TONE (Tone Controls)

3) BODY (Mic & body modeling)

5) DLY (Delay Modeling)

6) REV (Reverb Modeling)

7) NR (Noise reduction)

8) NOTCH (Notch effect)

9) RENAME

10) WRITE

3. Reloading the factory programs

Troubleshooting