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 

Song List

SONG BANK

Fingering Guide

Fingered 1, Fingered 2 Chords

1. With Fingered 2, interpreted as Am7.
2. With Fingered 2, interpreted as Am7b5.
3. 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.

1. (POWER) button 
2. VOLUME slider 
3. FUNCTION button 
4. METRONOME, BEAT button 
5. TEMPO buttons
6. REPEAT, INTRO button 
7. REW, NORMAL/FILL-IN button 
8. FF, VAR./FILL-IN button 
9. PAUSE, SYNCHRO/ENDING button 
10. PLAY/STOP, START/STOP button 
11. PART SELECT, ACCOMP/CHORDS button
12. TONE, SAMPLING DEMO button 
13. RHYTHM, ONE TOUCH PRESET button 
14. boSONG BANK button 
15. Number buttons, [–]/[+] keys 
16. SAMPLED TONES/EFFECTS 1, LISTEN button 
17. SAMPLED TONES/EFFECTS 2, WATCH button
18. SAMPLED TONES/EFFECTS 3, REMEMBER button 
19. SAMPLED TONES/EFFECTS 4, NEXT button 
20. SAMPLED TONES/EFFECTS 5, AUTO button 
21. VOICE PERCUSSION, LESSON button
22. Song Bank list
23. Built-in microphone
24. Display
25. SAMPLING button
26. Rhythm list
27. Tone list
28. CHORD root names
29. Percussion instrument list 

30. USB port 
    Back

    

31. SUSTAIN jack 
32. AUDIO IN jack 
33. DC 9.5V terminal 
34. 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.

1. Press 3 (FUNCTION).

   

2. 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

3. 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

1. Open the battery cover on the bottom of the Digital Keyboard.
2. 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.

3. 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.

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

1. Press bm (TONE).

   

2. 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.

3. 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.

1. Press 3 (FUNCTION) a number of times until “Reverb” appears on the display.

   

2. Use bp (10-key) [–] and [+] keys to select the reverb setting you want.

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

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

   

2. 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.

1. Press 3 (FUNCTION).

   

2. 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.

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

   

2. 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, 

1. Start by unpacking the keyboard and ensuring all parts are included. 
2. 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.
3. Turn on the keyboard by pressing the power button. 
4. Use the function buttons to select different tones, rhythms, and other features. 
5. 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

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.