Introduction Casio Key Portable Keyboard CT-X870IN

The Casio Key Portable Keyboard CT-X870IN is designed for musicians seeking a versatile and expressive instrument. Featuring 61 touch-sensitive keys, it incorporates the advanced AiX Sound Source technology, offering 600 tones and 195 rhythms, including a rich selection of Indian sounds. The keyboard also supports features like auto-accompaniment and an easy-to-read LCD screen, making it user-friendly for both practice and performance. The CT-X870IN is priced at approximately $299.

Specifications

1. Maximum capacity per song: Approximately 320 kilobytes 
2. Maximum capacity per rhythm: Approximately 64 kilobytes (1 kilobyte = 1,024 bytes) 

Design and specifications are subject to change without notice

General Guide

1. (Power) button 
2. VOLUME knob 
3. INTRO, REPEAT button 
4. 4NORMAL FILL-IN, A-B button 
5. VAR. FILL-IN, REW button 
6. ENDING/SYNCHRO START, FF button
7. SYNCHRO STOP, pause button 
8. START/STOP, PLAY/STOP button 
9. [ACCOMP], PART SELECT, MUSIC PRESET button 
10. PIANO/ORGAN, TOUCH button 
11. TONE button 
12. RHYTHM button 
13. SONG BANK button 
14. CATEGORY button 
15. RECORD/STOP button 
16. CHORD MODE, CHORD BOOK button 
17. A.HAR./ARPEG., TYPE button 
18. EASY MODE, BANK, $FREEZE button 
19. Area1, LISTEN button 
20. Area2, WATCH button 
21. Area3, REMEMBER button
22. Area4, PHRASE button 
23. STORE button 
24. SPLIT, POINT button 
25. LAYER, OCTAVE button 
26. METRONOME, BEAT button 
27. TEMPO/TAP button 
28. FUNCTION button 
29. Number keys
30. [–] and [+] keys 
31. Speakers
32. Song Bank list
33. Rhythm list
34. Tone list
35. Display
36. Tray
    • The tray is angled slightly. Take care so items placed on it do not slide off.
    • Do not place cups or any other liquid containers on the tray.
37. PITCH BEND wheel
38. CHORD root names
39. Percussion instrument list 
    Back
40. USB flash drive 
41. USB port 
42. PEDAL jack 
43. AUDIO IN jack 

44. DC 9.5V terminal 

    

45. PHONES/OUTPUT jack 

Casio Key Portable Keyboard CT-X870IN Display

1. Tone, rhythm, song bank, Music Preset indicators
2. Indicators
3. Number, setting name/status display
4. I N F V E (Auto Accompaniment Types) indicators*, ACCOMP (Auto Accompaniment) indicator
5. Chord name
6. Tempo, measure
7. Beat display
8. Part, fingering display
9. Keyboard display
10. Registration bank indicator/Track Indicator
    I:Intro, N:Normal, F:Fill-in, V:Variation, E:Ending

Using the (29) Number Keys and the (30) [–] and [+] Keys

Number Keys

Use the number keys to enter numbers and values.

1. Use the number keys to enter the same number of digits as the displayed value.
   Example: To enter tone number 001, input 03 03 1.

   

   
   While entering a value, you can apply your input by pressing 28 FUNCTION.
   Example: To enter and apply tone number 010, input 1⇒0⇒ 28 FUNCTION.
   To cancel input, long-press the [5] (EXIT) key.

If the NUM indicator is not shown on the display, press the [0] number key to display it and then input the value you want.

[–] and [+] Keys

Pressing [–] reduces the currently displayed number or value by one, while [+] increases it by one. Holding down either button will sequentially increase or decrease the displayed number or value until you release the button. Pressing both buttons at the same time will return the number or value to its initial default or recommended setting.

If input of a negative value is allowed, pressing [–] while the value is flashing on the display will add a minus sign (–) to the left of the value. Pressing [+] while the value is flashing on the display changes back to a positive value.

[2] (o), [3] (p), [5] (EXIT), and [6] (ENTER) Keys

Depending on the operation being performed, [2] (o), [3] (p), [5] (EXIT), and [6] (ENTER) key operations are enabled while the NUM indicator is not shown on the display.

[5] (EXIT) Key Long-press

After configuring function settings with the Function (28) button, you can exit the setting screen by long-pressing [5] (EXIT). For details, see “FUNCTION Button (28) Functions” (page EN-43).

Categories

In the modes listed below the category (group) of the currently selected type will be shown on the display. You can change the category, if you want.

• Tones
• Rhythms
• Songs
• Music Presets

To check the current category

1. Press 14 CATEGORY.
   • Each press of 14 CATEGORY selects the first number of the next sequential category.
   • After pressing 14 CATEGORY, you can also scroll forward and back between category names using the 30 [–] and [+] keys.
   • If you do not perform any operation for a while after displaying a category, the display will automatically return to the previous screen.
   • To return to the previous screen, press 28 FUNCTION.

NOTE

• For information about the categories available in each mode, refer to the “Category” column of the lists.
• You can directly scroll between top entries of categories by holding down 14 CATEGORY as you use the 30 [–] and [+] keys to scroll.

Returning the Digital Keyboard to Its Factory Default Settings

Perform the following procedure when you want to return the Digital Keyboard’s stored data and settings to their initial factory defaults.

Connecting to Audio Equipment

This Digital Keyboard can be connected to commercially available stereo, amplifier, or recording equipment, to a portable audio player or other equipment.

Outputting Keyboard Notes to Audio Equipment

Connection requires commercially available connecting cords, supplied by you.

The connecting cords should have a stereo standard plug on one end and a plug that matches the configuration of the external device on the other end.

IMPORTANT

• Turn off the external device when making connections. After connecting, turn down the Digital Keyboard and external device volume levels whenever turning power on or off.
• After connecting, turn on the Digital Keyboard and then the external device.
• If keyboard notes sound distorted when they are sounded from external audio equipment, lower the Digital Keyboard’s volume setting.

Playing an External Device from the Digital Keyboard

Connection requires commercially available connecting cords, supplied by you.

• The connecting cords should have a stereo mini plug on one end and a plug that matches the configuration of the external device on the other end.
• Turn off the Digital Keyboard when making connections. After connecting, turn down the Digital Keyboard and external device volume levels whenever turning power on or off.
• After connecting, turn on the external device and then the Digital Keyboard.
• If notes are distorted when they are sounded on the external device, lower the volume setting of the external device.

Digital Keyboard en AUDIO IN jack

Center Cancel (Vocal Cut)

Enabling Vocal Cut cuts (mutes or minimizes) the vocal in the sound being input from the en AUDIO IN jack. Note that this function cancels the sound in the center position of the audio, which may (depending on how the original audio was mixed) end up canceling something else other than the vocal part. How vocal cut is performed depends on the sound being input.
For information about configuring settings, “FUNCTION Button (cs) Functions” (page EN-43).

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.

Description

Convenience and longevity were considered in the construction of the CT-X870IN. The full-size keys offer a pleasant playing experience, and its small size makes it portable. A backlit LCD display on the keyboard facilitates navigating through the many settings and operations. Users may experiment with a variety of musical styles, from classical to modern genres, thanks to its vast collection of sounds and rhythms.

A fun and imaginative touch to the keyboard is the Dance Music Mode, a special function that lets users compose and play along with dance music tracks. It is an excellent tool for recording and producing music because of its USB-MIDI and audio interface, which also allow for smooth communication with computers and other musical instruments.

Setup Guide

It is simple to set up the Casio Key Portable Keyboard CT-X870IN. Here is a detailed guide:

1. Unbox the keyboard and ensure all components are included (keyboard, power adapter, music stand, etc.).
2. Insert batteries or connect the AC adapter to power the keyboard.
3. Adjust the music stand to your preferred height.
4. Connect the keyboard to a computer or other devices via USB-MIDI or audio interface if necessary.
5. Familiarize yourself with the interface by navigating through the menus and settings using the buttons and controls.

Important!
Please note the following important information before using this product.

• Before using the optional AC Adaptor to power the unit, be sure to check the AC Adaptor for any damage first. Carefully check the power cord for breakage, cuts, exposed wire and other serious damage. Never let children use an AC adaptor that is seriously damaged.
• Never attempt to recharge batteries.
• Do not use rechargeable batteries.
• Never mix old batteries with new ones.
• Use recommended batteries or equivalent types.
• Always make sure that positive (+) and negative (–) poles are facing correctly as indicated near the battery compartment.
• Replace batteries as soon as possible after any sign they are getting weak.
• Do not short-circuit the battery terminals.
• The product is not intended for children under 3 years.
• Use only a CASIO AD-E95100L adaptor.
• The AC adaptor is not a toy.
• Be sure to disconnect the AC adaptor before cleaning the product.

Troubleshooting

Error Indicators

Pros & Cons

Pros

• Extensive library of tones and rhythms
• Portable and lightweight design
• Touch-sensitive keys for expressive playing
• Dance Music Mode for creative music-making
• USB-MIDI and audio interface for connectivity

Cons

• No weighted keys; may not be ideal for pianists looking for an authentic piano feel
• Some users find the menu navigation complex
• Battery life may vary depending on usage

Customer Reviews

The Casio Key Portable Keyboard CT-X870IN has received high marks from customers for both its sound quality and adaptability. Numerous customers value the extensive feature set and user-friendliness, particularly for novices. Some have pointed out that the menu system might initially be a little daunting, too.

The absence of weighted keys and a few minor battery life concerns are frequent grievances. Because of its performance and value, the CT-X870IN is generally well rated.