Introduction

The Casio Key Portable Keyboard CTK-2400 is an excellent entry-level instrument, perfect for beginners and hobbyists. It features 61 piano-style keys and offers a wide range of sounds with 400 built-in tones and 150 rhythms. The keyboard includes a sampling function with a built-in microphone, allowing users to create unique sounds. Additionally, the Step-Up Lesson system supports learning and skill development. The CTK-2400 is available for approximately $99.

Specifications

Model	CTK-2090/CTK-2400
Keyboard	61 standard-size keys
Maximum Polyphony	48 notes (24 for certain tones)
Tones
Built-in Tones	400
Sampling Tones	1 (Long Sampling) or 5 (Short Sampling) Sampling Time: 2 second (Long Sampling) or approximately 0.4 seconds each (Short Sampling) Effects: 5 types Sampling Demo Tune: 1
Reverb	1 to 10, Off
Metronome Beats per Measure Tempo Range	0, 2 to 6 30 to 255
Song Bank Tunes	110
Step Up Lesson
Lessons	5 (Listen, Watch, Remember, Next, Auto)
Lesson Part	L, R, LR
Functions	Repeat, Voice Fingering Guide, Note Guide, Performance Evaluation
Auto Accompaniment
Rhythm Patterns	150
One Touch Presets	150
Other Functions Transpose Tuning	±1 octaves (–12 to +12 semitones) A4 = 415.5 to 465.9 Hz (Initial Default: 440.0 Hz)
MIDI	16 multi-timbre received, GM Level 1 standard
Musical Information Function	Tone, Rhythm, Song Bank numbers and names, staff notation, fingering, pedal operation, tempo, measure and beat number, chord name, etc.
Inputs/Outputs
USB port	TYPE B
Sustain jack	Standard jack (sustain, sostenuto, soft, rhythm)
Phones/Output jack	Stereo standard jack Output Impedance: 200Ù, Output Voltage: 4.5V (RMS) MAX
Audio In jack	Stereo mini jack Input Impedance: 9kÙ, Input Sensitivity: 200mV
Built-in microphone
Power Jack	9.5V DC
Power Supply	2-way
Batteries	6 AA-size zinc-carbon batteries or alkaline batteries
Battery Life	Approximately 3 hours continuous operation on alkaline batteries
AC Adaptor	AD-E95100L
Auto Power Off	Approximately 6 minutes (during battery operation) or 30 minutes (during AC adaptor operation) without any operation
Speakers Output	10cm × 2 2W + 2W
Power Consumption	9.5V = 7.7W
Dimensions	94.6 × 30.7 × 9.2 cm (37 1/4 × 12 1/16 × 3 5/8 inch)
Weight	Approximately 3.4kg (7.5 lbs) (without batteries)

Song List

SONG BANK

	WORLD
001	TWINKLE TWINKLE LITTLE STAR
002	LIGHTLY ROW
003	LONG LONG AGO
004	ON TOP OF OLD SMOKEY
005	SAKURA SAKURA
006	WHEN THE SAINTS GO MARCHING IN
007	AMAZING GRACE
008	AULD LANG SYNE
009	COME BIRDS
010	DID YOU EVER SEE A LASSIE?
011	MICHAEL ROW THE BOAT ASHORE
012	DANNY BOY
013	MY BONNIE
014	HOME SWEET HOME
015	AURA LEE
016	HOME ON THE RANGE
017	ALOHA OE
018	SANTA LUCIA
019	FURUSATO
020	GREENSLEEVES
021	JOSHUA FOUGHT THE BATTLE OF JERICHO
022	THE MUFFIN MAN
023	LONDON BRIDGE
024	UNDER THE SPREADING CHESTNUT TREE
025	SIPPIN’ CIDER THROUGH A STRAW
026	GRANDFATHER’S CLOCK
027	ANNIE LAURIE
028	BEAUTIFUL DREAMER
029	IF YOU’RE HAPPY AND YOU KNOW IT, CLAP YOUR HANDS
030	MY DARLING CLEMENTINE
031	LITTLE BROWN JUG
032	HOUSE OF THE RISING SUN
033	SHE WORE A YELLOW RIBBON
034	YANKEE DOODLE
035	MY OLD KENTUCKY HOME
036	SZLA DZIEWECZKA
037	TROIKA
038	WALTZING MATILDA
039	ON THE BRIDGE OF AVIGNON
040	I’VE BEEN WORKING ON THE RAILROAD
041	OH! SUSANNA
042	CAMPTOWN RACES
043	JEANNIE WITH THE LIGHT BROWN HAIR
044	TURKEY IN THE STRAW
045	JAMAICA FAREWELL

	EVENT
046	SILENT NIGHT
047	WE WISH YOU A MERRY CHRISTMAS
048	JINGLE BELLS
049	JOY TO THE WORLD
050	O CHRISTMAS TREE
	PIANO/CLASSICS
051	MARY HAD A LITTLE LAMB
052	LE CYGNE FROM “LE CARNAVAL DES ANIMAUX”
053	JE TE VEUX
054	SONATA op.13 “PATÉTIQUE” 2nd Mov.
055	HEIDENRÖSLEIN
056	AIR FROM “SUITE no.3”
057	SPRING FROM “THE FOUR SEASONS”
058	HABANERA FROM “CARMEN”
059	BRINDISI FROM “LA TRAVIATA”
060	HUNGARIAN DANCES no.5
061	MINUET IN G MAJOR
062	MUSETTE IN D MAJOR
063	GAVOTTE (GOSSEC)
064	ARABESQUE (BURGMÜLLER)
065	CHOPSTICKS
066	DECK THE HALL
067	ODE TO JOY
068	AVE MARIA (GOUNOD)
069	SONATINA op.36 no.1 1st Mov.
070	PRELUDE op.28 no.7 (CHOPIN)
071	RÊVERIE
072	GYMNOPÉDIES no.1
073	GOING HOME FROM “FROM THE NEW WORLD”
074	FÜR ELISE
075	TURKISH MARCH (MOZART)
076	SONATA op.27 no.2 “MOONLIGHT” 1st Mov.
077	ETUDE op.10 no.3 “CHANSON DE L’ADIEU”
078	THE ENTERTAINER
079	WEDDING MARCH FROM “MIDSUMMER NIGHT’S DREAM”
080	AMERICAN PATROL
081	FRÖHLICHER LANDMANN
082	LA CHEVALERESQUE
083	SONATA K.545 1st Mov.
084	LA PRIÈRE D’UNE VIERGE
085	VALSE op.64 no.1 “PETIT CHIEN”
086	LIEBESTRÄUME no.3
087	JESUS BLEIBET MEINE FREUDE
088	CANON (PACHELBEL)
089	SERENADE FROM “EINE KLEINE NACHTMUSIK”
090	MARCH FROM “THE NUTCRACKER”
	EXERCISE
091-100	EXERCISE I
101-110	EXERCISE II

Fingering Guide

Fingered 1, Fingered 2 Chords

With Fingered 2, interpreted as Am7.
With Fingered 2, interpreted as Am7b5.
Inverted form not supported in some cases.

Fingered 3, Full Range Chords

In addition to the chords that can be fingered with Fingered 1 and Fingered 2, the following chords also are recognized.

NOTE

With Fingered 3, the lowest note fingered is interpreted as the base note. Inverted forms are not supported.
With Full Range Chord, when the lowest note fingered is a certain distance from the neighboring note, the chord is interpreted as a fraction chord.
Unlike Fingered 1, 2, and 3, Full Range Chord requires pressing of at least three keys to form a chord.

Chord Example List

Description

Usability was a primary consideration in the development of the Casio CTK-2400. The user interface of the keyboard is straightforward, with buttons that are easy to identify and a straightforward structure that makes it simple to move through the keyboard's many functionalities. The sound quality is remarkable, with tones that are both clear and rich, which contribute to an overall improvement in the playing experience.

Moreover, the mobility of the keyboard is an additional major advantage. Because of its weight of slightly more than seven pounds and its ability to be easily transported in a bag or backpack, it is an excellent choice for artists who are on the road or for students who need to bring their instrument to rehearsals or lessons.

Casio Key Portable Keyboard CTK-2400 General Guide

In this manual, the term “Digital Keyboard” refers to the CTK-2090/CTK-2400.
Illustrations in this User’s Guide show the CTK-2400.
In this manual, buttons and other controllers are identified using the numbers shown below.

The following explains the meaning of the symbol that appears on the product console and with the key names below. $: Indicates a function that is enabled by holding down the button for some time.

(POWER) button
VOLUME slider
FUNCTION button
METRONOME, BEAT button
TEMPO buttons
REPEAT, INTRO button
REW, NORMAL/FILL-IN button
FF, VAR./FILL-IN button
PAUSE, SYNCHRO/ENDING button
PLAY/STOP, START/STOP button
PART SELECT, ACCOMP/CHORDS button
TONE, SAMPLING DEMO button
RHYTHM, ONE TOUCH PRESET button
boSONG BANK button
Number buttons, [–]/[+] keys
SAMPLED TONES/EFFECTS 1, LISTEN button
SAMPLED TONES/EFFECTS 2, WATCH button
SAMPLED TONES/EFFECTS 3, REMEMBER button
SAMPLED TONES/EFFECTS 4, NEXT button
SAMPLED TONES/EFFECTS 5, AUTO button
VOICE PERCUSSION, LESSON button
Song Bank list
Built-in microphone
Display
SAMPLING button
Rhythm list
Tone list
CHORD root names
Percussion instrument list
USB port
Back
SUSTAIN jack
AUDIO IN jack
DC 9.5V terminal
PHONES/OUTPUT jack

Using the 10-key Pad

Use the number buttons and the [–] and [+] keys to change the settings of the parameters that appear in the upper left area of the display.

Number Buttons

Use the number buttons to enter numbers and values.

Enter the same number of digits as the currently displayed value.
Example: To enter tone number 004, input 0 3 0 3 4.
Negative values cannot be input using the number buttons. Use [+] (increase) and [–] (decrease) instead.

[–] and [+] Keys

You can use the [+] (increase) and [–] (decrease) keys to change the displayed number or value.

Holding down either key scrolls the displayed setting.
Pressing both keys at the same time will revert to the initial default setting or the recommended setting.

Using the FUNCTION Button

Use the FUNCTION button (3) to access settings that let you select the reverb type, pedal effect, etc.

Press 3 (FUNCTION).

Next press 3 (FUNCTION) until the parameter whose setting you want to change is displayed.

Each press of 3 (FUNCTION) cycles through the available parameters.

To scroll backwards through parameters, hold down 3 (FUNCTION) as you press 4 (METRONOME).

	Parameter	Display	See Page
1	Transpose	Trans.	EN-10
2	Accompaniment Volume	AcompVol	EN-31
3	Song Volume	Song Vol	EN-19
4	Tuning	Tune	EN-10
5	Reverb	Reverb	EN-9
6	Voice Fingering Guide	Speak	EN-24
7	Note Guide	NoteGuid	EN-25
8	Performance Evaluation	Scoring	EN-25
9	Phrase	PhraseLn	EN-25
10	Sampling Start	SampAuto	EN-15
11	Sampling Play Back	SampPB	EN-16
12	Auto Incrementing during Short Sampling	AutoIncr	EN-16
13	Keyboard Channel	Keybd Ch	EN-33
14	Navigate Channels	Navi. Ch	EN-33
15	Local Control	Local	EN-34
16	Accomp Out	AcompOut	EN-34
17	Pedal Effect	Jack	EN-9

When the parameter you want is displayed, use bp (10-key) to change its setting.
The parameter setting will disappear from the upper left area of the screen if you do not perform any operation for some time.

Getting Ready to Play

Preparing the Music Stand

Power Supply

Either an AC adaptor or batteries can be used to power this Digital Keyboard. Normally, use of AC adaptor power is recommended.

The AC adaptor does not come with this Digital Keyboard. Purchase it separately from your retailer. See page EN-1 for information about options.

Using the AC Adaptor

Make sure that you use only the AC adaptor specified for this Digital Keyboard. Use of a different type of AC adaptor can cause malfunction.

Be sure to turn off Digital Keyboard power before connecting or disconnecting the AC adaptor.
The AC adaptor will become warm to the touch after very long use. This is normal and does not indicate malfunction.
To prevent breaking of the wire, take care to avoid putting any type of load on the power cord.
Never insert metal, pencils, or any other objects into the product’s 9.5V DC terminal. Doing so creates the risk of accident.

Using Batteries

IMPORTANT

Be sure to turn off power before loading batteries.
It is up to you to prepare six commercially available AA-size batteries. Do not use oxyride batteries or any other nickel based batteries

Open the battery cover on the bottom of the Digital Keyboard.
Load six AA-size batteries into the battery compartment.
Make sure the positive + and negative - ends of the batteries are facing as shown in the illustration.
Insert the tabs of the battery cover into the holes on the side of the battery compartment, and close the cover.

Low Battery Indication
The indicator shown below starts to flash to let you know when battery power is low. Replace the batteries with new ones.

low_battery_indication_casio_key_portable_keyboard_ctk-2400.png

Controlling the Keyboard Sounds

Select from a variety of musical instrument sounds

Your Digital Keyboard lets you select tones for a wide variety of musical instrument sounds, including violin, flute, orchestra, and more. Even the same song sound takes on a different feel by changing the instrument type.

To select an instrument for playing

Press bm (TONE).
Use bp (10-key) to select the tone number you want.
The corresponding tone number and tone name will appear on the screen.
- Use the number buttons to enter the tone number. Specify three digits for the tone number.
Example: To select 001, enter 0 3 0 3 1.
NOTE
- See the separate “Appendix” for a complete list of available tones.
- When one of the drum sets is selected (tone numbers 395 through 400), each keyboard key is assigned a different percussion sound.
Try playing something on the keyboard.
The tone of the instrument you selected will sound.

Playing with a Piano Tone (Piano Setup)

Press bm (TONE) and bn (RHYTHM) at the same time. This selects the grand piano tone.

Settings

Tone Number: “001”
Reverb: “06”
Transpose: “00”
Pedal Effect: SUS
Rhythm Number: “131”
Accompaniment: Rhythm part only
Local Control: On
Voice Percussion:Off

Using Reverb

Reverb adds reverberation to notes. You can change the duration of the reverb.

Press 3 (FUNCTION) a number of times until “Reverb” appears on the display.
Use bp (10-key) [–] and [+] keys to select the reverb setting you want.

Off (oFF)	Turns off reverb.
1 to 10	The larger the number selected, the longer the reverb duration.

using_reverb_of_casio_key_portable_keyboard_ctk-2400.png

Using a Pedal

A pedal can be used to change notes in various ways while playing.

A pedal unit does not come with the Digital Keyboard. Purchase one separately from your retailer. See page EN-1 for information about options.

Connecting a Pedal Unit

Connect an optional pedal unit.

Selecting the Pedal Effect

Press 3 (FUNCTION) a number of times until “Jack” appears on the display (page EN-4).

Use bp (10-key) [–] and [+] keys to select the pedal effect you want.

The following shows the available pedal effects.

Sustain (SUS)	Sustains notes played while the pedal is depressed. Organ and other similar tone notes are sustained even if the pedal is not pressed.
Sostenuto (SoS)	Sustains notes that are playing when the pedal is depressed before the keyboard keys are released.
Soft (SFt)	Slightly softens notes played while the pedal is depressed.
Rhythm (rHy)	Pressing the pedal starts and stops Auto Accompaniment or song playback.

Changing the Pitch (Transpose, Tuning)

Changing the Pitch in Semitone Steps (Transpose)

The transpose feature lets you change the pitch, in semitone steps. A simple operation lets you instantly change the pitch to match that of a singer.
The transpose setting range is –12 to +12 semitones.

Press 3 (FUNCTION).
Use bp (10-key) [–] and [+] keys to select the transpose setting you want.

Fine Tuning (Tuning

Use the tuning feature when you need to adjust the pitch slightly to play along with another musical instrument. Also, some artists perform their music with slightly altered tuning. You can use the tuning feature to adjust tuning so it exactly matches a performance on a CD.

The tuning feature specifies the frequency of the A4 note. You can set a frequency within the range of 415.5 to 465.9 Hz. The initial default setting is 440.0 Hz.

Press 3 (FUNCTION) a number of times until “Tune” appears on the display (page EN-4).
Use bp (10-key) [–] and [+] keys to adjust the tuning.
- Performing this step causes the display to change from “Tune” to a value that indicates the current frequency setting as shown below. You can change the frequency in 0.1Hz steps.
- Even if you do not perform a bp (10-key) operation to adjust the tuning, the current frequency setting will appear automatically after a few seconds.

Setup Guide

To set up the Casio,

Start by unpacking the keyboard and ensuring all parts are included.
Connect the AC adapter to the power input on the keyboard and plug it into a wall outlet. If using batteries, insert six AA batteries into the battery compartment.
Turn on the keyboard by pressing the power button.
Use the function buttons to select different tones, rhythms, and other features.
For pairing with a device via USB, connect the USB cable to the keyboard and the other end to your computer or tablet. Download and install Casio's Chordana Play app to access additional functionalities.

Casio CTK-2400 Troubleshooting

	Symptom	Action
Included Accessories
	I can’t find something that should be here.	Carefully check inside all of the packing materials.
Power Requirements
	Power will not turned on.	Check the AC adaptor or make sure that the batteries are facing correctly (page EN-5). Replace the batteries with new ones or switch over to AC adaptor power (page EN-5).
	The Digital Keyboard outputs a loud sound and then suddenly powers down.	Replace the batteries with new ones or switch over to AC adaptor power (page EN-5).
	The Digital Keyboard suddenly powers down after a few minutes.	This happens when Auto Power Off (page EN-6) is triggered.
Display
	The display keeps going out or are flashing.	Replace the batteries with new ones or switch over to AC adaptor power (page EN-5).
	On-screen keyboard keys or notes remain on the display.	A Step Up Lesson is in progress and the Digital Keyboard is waiting for you to play the next note in the song. To stop this from happening, cancel the lesson (page EN-23).
	Screen contents are visible only from straight ahead.	This is dues to production limitations. It does not indicate malfunction.
Sound
	Nothing happens when I press any keyboard key.	Adjust the main volume setting (page EN-6). Check if something is plugged into the PHONES/OUTPUT jack (dp) on the back of the Digital Keyboard. Turn power off and then back on to initialize all Digital Keyboard settings (page EN-6).
	Nothing happens or notes do not play normally when I play notes on the left side of the keyboard.	Press bl to disable chord input in the accompaniment keyboard area (page EN-28).
	Nothing happens when I start an Auto Accompaniment.	With rhythms 140, and 142 to 150, nothing will sound until you play a chord on the keyboard. Try playing a chord (page EN-28). Check and adjust the accompaniment volume setting (page EN-31). Turn power off and then back on to initialize all Digital Keyboard settings (page EN-6).
	Nothing happens when I start playback of a built-in song.	It takesa little timeafter you pressthe button untilthe song startsto play. Wait for a moment for the song to start. Check and adjust the song volume (page EN-19). Turn power off and then back on to initialize all Digital Keyboard settings (page EN-6).
	The metronome does not sound.	Check and adjust the accompaniment volume setting (page EN-31). Check and adjust the song volume (page EN-19). Turn power off and then back on to initialize all Digital Keyboard settings (page EN-6).
	Notes keep sounding, without stopping.	Turn power off and then back on to initialize all Digital Keyboard settings (page EN-6). Replace the batteries with new ones or switch over to AC adaptor power (page EN-5).

Some notes are cut off while they are playing.	Notes are cut off whenever the number of notes being sounded exceeds the maximum polyphony value of 48 (24 for some tones). This does not indicate malfunction.
The volume or tone setting I made has changed.	Adjust the main volume setting (page EN-6). Turn power off and then back on to initialize all Digital Keyboard settings (page EN-6). Replace the batteries with new ones or switch over to AC adaptor power (page EN-5).
In certain keyboard ranges, the volume and tone quality sound are slightly different from those in other keyboard ranges.	This is due to system limitations. It does not indicate malfunction.
With some tones, octaves do not change at the far ends of the keyboard.	This is due to system limitations. It does not indicate malfunction.
The pitch of the notes does not match other accompanying instruments or sounds strange when played long with other instruments.	Check and adjust the transpose (page EN-10) and tuning settings (page EN-10). Turn power off and then back on to initialize all Digital Keyboard settings (page EN-6).
The reverb of notes seems to change suddenly.	Check and adjust the reverb setting (page EN-9). Turn power off and then back on to initialize all Digital Keyboard settings (page EN-6).
Sounds I sampled were deleted.	Be sure to press the power button to turn off power. Unplugging or disconnecting the AC adaptor without first pressing the power button to turn off power will cause sampled sounds to be deleted.
Even though I didn’t input anything with the built-in microphone, the message “Sampled!” appears on the display when I release the SAMPLING button.	Perform the sampling operation where it is quiet. You may be making noise, which is picked up as sampled sound, when releasing the SAMPLING button release operation. If this is the case, release the SAMPLING button carefully to avoid making noise. Use the procedure under “Starting a Sampling Operation Manually” (page EN-15) to turn off SampAuto, and then try manual sampling.
Rhythms played in the VOICE PERCUSSION Mode sound strange and unnatural.	In order to assure proper balance for the rhythm, be sure to record all five short samples. Playing a rhythm in the VOICE PERCUSSION Mode while there is no short sample will cause a preset sample to sound. If there is even a single short sample recorded, rhythm instruments will sound only for the recorded short sample.
Operation
When I perform a skip forward or skip back operation, the skip operation moves multiple song measures instead of only a single measure.	While song playback is stopped or a Step Up Lesson is in progress, skip forward and skip back operations are performed in phrase units (page EN-18).
Computer Connection
I can’t exchange data between the Digital Keyboard and a computer.	Check to make sure that the USB cable is connected to the Digital Keyboard and computer, and that the device is selected correctly with your computer’s music software settings (page EN-32). Turn off the Digital Keyboard and then exit the music software on your computer. Next, turn the Digital Keyboard back on and then restart the music software on your computer.

Pros & Cons

Pros

Lightweight and portable design
Rich feature set with 150 rhythms and 400 tones
Simple to use and with an intuitive interface
Reasonably priced
Touch sensitivity and an integrated educational system
Compatibility with the Chordana Play app from Casio

Cons

Restricted number of keys (61 full-size keys)
MIDI output is absent (just USB)
Absence of an integrated recording feature
The built-in speakers seem weaker to certain users.

Customer Reviews

Consumers typically commend the Casio CTK-2400 for its excellent sound quality, affordability, and ease of use. Many novices enjoy the range of tones and rhythms offered as well as the integrated instruction structure. According to several customers, the keyboard is rather durable and can sustain years of frequent usage.

The restricted key count and absence of MIDI output are frequent grievances, which may make it unsuitable for more experienced pianists. All things considered, nevertheless, the CTK-2400 is well recognized for its adaptability and appropriateness for both beginning and intermediate players.

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