Discontinued CASIO GP-400 Hybrid Digital Piano


HK$27,980.00  HK$37,980.00

Casio GP-400 top digital grand piano

Casio released a new model of the Grand Hybrid digital grand piano series at this year's Frankfurt International Music Fair: GP-400 BK

The latest generation of GP-400 BK follows most of the characteristics of GP-500, including three sets of top-level grand piano sounds, and is equipped with top-of-the-line wooden feel keyboards. It is jointly developed with Bechstein and has almost the same keyboard as grand pianos. The dynamic characteristics and the ability of 27 combos per second. The rear and side panels of the appearance adopt an arc design, and the height of the piano body is also increased. The height design from the keyboard to the music stand is exactly the same as that of a grand piano. When playing, not only the tone and keyboard, but also the visual experience of reading the score is also more Get close to the grand piano!

GP-400 Grand Hybrid Piano


GP-400 is a new product in the CELVIANO Grand Hybrid series, equipped with Casio's AiR Grand sound source, which accurately reproduces the synthesized tone, mechanical sound, and texture of a grand piano.

GP-400 replicates three world-class piano samples, the rich resonance of various strings and dampers, the sound of mechanical structure movement, and various other subtle resonances to convey the charm of the original sound. Casio's Natural Grand Hammer Action Keyboard can express more details.

The same key production process as the grand piano, the six-speaker amplifier system, and the new grand piano acoustic system can produce a three-dimensional sound field that is very similar to the sound of a grand piano. The top speaker sends out the upward sound, and the downward speaker sends out the sound transmitted from under the soundboard. Both the performer and the audience can get an immersive experience.


  • AiR Grand sound source
  • Natural Grand Piano Hammer Action Keyboard
  • Concert performance mode and scene

Number of keys 88
Touch sensitive
Touch sensitive
60 songs
60 songs


GP-400BK has a magnificent appearance and stable performance. The overall performance is comparable to a grand piano, allowing pianists to play a grand piano-like feeling and visual effects. GP-400BK pays great attention to details, such as a wide music stand, stable feet and other components, making it more elegant.

Sound effect

The characteristics and sounds of the three legendary pianos are faithfully reproduced

CELVIANO Grand Hybrid can even reproduce the subtle sound changes of world-renowned pianos. In this project, CASIO selected three pianos from Berlin, Hamburg and Vienna. CASIO meticulously studied and analyzed the characteristics of each piano. CELVIANO Grand Hybrid uses CASIO's advanced technology to reproduce the charming sound of these pianos. Let you experience the experience of owning three of the best pianos in the world at the same time.

Berlin [Berlin Grand Piano]

The sound quality is balanced and elegant. Most suitable for playing Impressionist music. The characteristic is that the tone of the entire sound range is clear and clear.

Hamburg [Hamburg Grand Piano]

The sound quality is rich and charming. The performance range of music is wide and is beloved by pianists. Suitable for different playing styles and types.

Vienna [Vienna Grand Piano]

Its bass range is impressive. The sound is warm and thick, whether it is soft or passionate interpretation is very good. The ideal instrument for playing classic music.

Co-developing sound effects

The sound effects of the Berlin grand piano were jointly developed by CASIO and C. Bechstein. CASIO seeks clear, balanced and elegant sound for the CELVIANO Grand Hybrid. CASIO has made a very in-depth study on C.Bechstein's ultimate masterpiece D282 to achieve this goal. The service director Mr. Albrecht and C. Bechstein’s piano maker visited CASIO R&D to monitor the sound development process until the final modification was completed.

About C. Bechstein

Since Carl Bechstein founded the Pianoforte workshop in Berlin in 1853, C. Bechstein's name has been synonymous with the top upright grand piano. C. Bechstein pianos have been favored by many famous composers and performers for their excellent sound quality and touch for many years. In the 21st century, C. Bechstein is still recognized as one of the best piano manufacturers in the world.

AiR Grand sound source

CELVIANO Grand Hybrid is equipped with AiR Grand sound source, a brand new system developed by CASIO with its latest sound technology. Contains many powerful functions. Multi-faceted pattern conversion allows players to smoothly switch between soft and passionate styles. The acoustic simulator reproduces the sound of a traditional grand piano. AiR Grand sound source brings you a realistic playing experience.
Learn more about

Multi-directional type conversion

For a traditional grand piano, the volume and sound quality are constantly changing from the moment the keys are played until the sound of the piano slowly disappears. CASIO's multi-directional pattern conversion technology can ensure that the volume and tone can be switched naturally and smoothly according to the strength of the touch key. This technique makes the performance of the player more expressive.

Resonance system

The grand piano can play different types of resonance sounds, which is extremely important to the playing experience. The CELVIANO Grand Hybrid is equipped with a string resonance function, which allows the strings to harmonize naturally after pressing the keys. Damper resonance can reproduce the resonance produced by stepping on the damper pedal. GP-400BK's open string resonance and equal division resonance can make the piano sound more realistic. Players can use the CASIO resonance system to select, control and synthesize the resonance sound of the grand piano strings and soundboard according to the playing environment.

Action sound system

The grand piano also produces several sound effects related to mechanical operation, which is an important part of the playing experience. By reproducing these mechanical sound effects, CASIO more accurately simulates a grand piano. The piano has 4 different operating sound effects, and the volume of each sound effect can be set or turned off independently.

Off-key simulator

The continuous musical tone displayed by the grand piano varies in length with the speed at which the player's fingers leave the keys after pressing the keys. In a similar way, the CASIO key-off simulator controls the length of the sound according to the speed at which the finger leaves the key. This allows players to show subtle differences when playing staccato and legato tunes.

Hammer reaction

Even if the strength of the keys is the same, the duration of the sound of the grand piano will have subtle differences depending on the different keys that are pressed. In order to bring out the best playing realism, CASIO has made appropriate settings for the tones of the three grand pianos. The sound generation time can also be adjusted to suit the needs of the player.

Grand piano pedal system

Grand piano pedal system

CASIO's grand piano pedal system continuously detects the position of the damper pedal and the angle at which the pedal is pressed to fine-tune the volume and duration of the sound. In addition, the player can adjust the pedaling position through the half-pedal position function, so that the damper effect can be integrated into the performance according to their own preferences. The GP-400BK's action sound system has the functions of damper noise and pedal action noise, which can reproduce the subtle operating sounds of a traditional grand piano.

Grand piano acoustic system

Grand piano acoustic system

CASIO has developed a brand new exclusive speaker system for the CELVIANO Grand Hybrid, which reproduces the sound characteristics emitted from the top and bottom of a traditional grand piano. The four-channel sound system is equipped with 6 speakers, which are carefully arranged in the design structure to play music from the inside of the body. This system brings players the same sound field experience as playing a traditional grand piano.

Adjustable lid position and lid simulator

Adjustable lid position

The design of the CELVIANO Grand Hybrid includes a top piano cover that can be raised and lowered manually. The position of the piano cover not only physically affects the tones played by the upper speakers, but also can accurately restore the characteristics of the adjustable cover of a traditional grand piano through the "cover position" setting.
The volume and tone of the sound produced by a grand piano are affected by the angle at which the lid is opened. The piano cover simulator can use digital technology to simulate these original sound effects. Players can choose from four kinds of piano cover angle effects to enjoy the ideal piano sound in their minds.

* Regardless of whether the top cover of the piano is opened or not, the setting parameters of the piano cover simulator will not change.

Concert hall simulator and listening position

Listening position

Equipped with 12 types of concert hall simulators, each type is set according to the results of careful analysis of the acoustic characteristics collected from world-renowned venues. Each venue has 4 listening position settings. For example, the player can simulate the listening experience in the auditorium or in front of the piano.

Volume synchronization equalizer

The volume synchronization equalizer is very useful for playing softly at home or when you want to play at low volume. This function effectively balances low-volume music sounds by adjusting the sound quality of the low-range and high-range ranges. Regardless of the volume, it can continue to provide you with a pleasant playing experience.

Volume synchronization equalizer
When the piano is played at a low volume, the tone of the bass and treble range will be compensated, thereby maintaining a natural musical tone.

Headphone mode

Headphone mode

Headphone mode automatically creates a wide sound image when the player wears headphones, recreating the feeling of playing a traditional piano. As the listening experience of headphones is greatly improved, players can play more naturally and experience the sound field experience of a traditional grand piano.


Your performance needs realism, which starts with the first touch of a key

The player's movements are transformed into music through a number of important elements. And the most touchable must be the keys. CELVIANO Grand Hybrid brings you a sense of reality from the first time you press a key. The new revolutionary natural grand piano hammer action keyboard, equipped with full-size wooden keys. Its new mechanism, equipped with real hammers, moves in the same trajectory as the grand piano used for performance. Open the lid, you can see the hammers move on the clear panel when playing. In addition to the standard acoustic mechanism, the new hammer action repeats the same scale at a faster speed than a traditional piano, but its touch is the same as a real piano.

Natural Grand Piano Hammer Action Keyboard

CASIO has developed a new keyboard system called "Natural Grand Piano Hammer Action Keyboard", which brings the touch of a real piano. This keyboard system is equipped with full-size wooden keys, and its hammers move in the same trajectory as the grand piano used for playing. The keys of the CELVIANO Grand Hybrid are made of exactly the same materials as the keys of a traditional grand piano. The surface of the keys has been carefully treated, and the wood of the key bed has also been carefully selected. This excellent action mechanism, combined with high-quality keyboard materials, greatly improves the playing experience, just like playing a traditional grand piano.
Learn more about

Natural Grand Piano Hammer Action Keyboard

1. Original triple induction action mechanism

CASIO's unique action mechanism brings excellent keyboard performance to CELVIANO Grand Hybrid. This mechanism includes the hammer action designed with reference to the grand piano, and three sensors, which can accurately grasp the player's emotions through the keys. Since there are no real strings, CASIO's hammer action can surpass the playing characteristics of a grand piano, providing a better playing experience, allowing players to play vibrato and easily repeat the same pitch.

2. Keyboard surface material

The white keys use acrylic, while the black keys use phenol, the same material used in modern grand pianos. This brings a cordial and familiar touch. Players will feel comfortable and confident through the keys of the CELVIANO Grand Hybrid.

3. The distance of the pivot point of the key

The pivot position of the keys is exactly the same as that of a grand piano. This makes the performance more stable, because the strength of the key touch does not change with the position of the finger on the key.

High quality Austrian spruce wood

The keyboard is made of high-quality Austrian spruce wood, which is the same as the keyboard of the C. Bechstein grand piano. These high-quality materials are carefully air-dried and processed before they are used to make piano keys.


The development of the keyboard takes the 88 keys into consideration independently and enables it to operate as a whole, ensuring a superior piano performance experience. CASIO has also made continuous improvements by studying the weight change and return speed of the keys to make the keyboard perfect.

Keyboard comparison

CASIO detects the overall strength of the keys when they are played. In addition, it mimics the operation of a grand piano and accurately reproduces the entire process of the keys when they are played.


Grand Hybrid brings you more experience than playing

Play in a legendary venue

CELVIANO Grand Hybrid is equipped with a concert hall simulator, which can simulate the acoustic effects of many different world-class performance venues. CASIO reproduces the acoustic characteristics of famous concert halls, opera houses, cathedrals and other performance venues around the world through advanced analysis and signal processing. You can select one of these settings instantly to bring a realistic feeling to your performance.
Learn more about

Play with the symphony orchestra

The concert performance mode of CELVIANO Grand Hybrid allows you to play the role of solo piano and ensemble with the symphony orchestra. The sound system will act as a symphony orchestra and play with you. Support the works of Tchaikovsky, Pahaibel, Smetana and other composers. You can slow down these movements to assist in practice.
Learn more about

Play according to music history

GP-400BK is equipped with additional functions, allowing players to design or choose the scene. You can customize your scene by choosing piano type, concert hall simulation and any desired effects. CASIO has created several inspiring preset scenes. These well-designed examples allow you to interact with music history. After choosing the name of a famous composer, the piano will be preset to match the settings of his music and the venue where these music may have been played.
Learn more about

Concert performance

Playing with the symphony orchestra is exciting. The concert performance function can simulate the performance of the entire symphony orchestra, allowing you to experience the experience of a piano soloist and the symphony orchestra on the same stage. Built-in 15 songs. When you practice, the convenient playback function allows you to: play, pause, fast forward, rewind, and AB part repeat. Using the slow mode, you can reduce the tempo of these songs to 80% of the normal tempo as needed.

Learn more about


Suitable for GP-400BK. This function allows the player to choose the most suitable sound environment. By choosing different combinations of tones, effects, and reverberation levels, scenes can be created. The default setting contains 15 scenes, which are designed according to different composers, music styles and venues. Users can also customize scenes and record up to 10 favorite settings.

Learn more about

General features

Audio recorder

CELVIANO Grand Hybrid pianos can record performances into stereo sound files (44.1 kHz stereo WAV format) via USB flash memory on the market. The recording can be stored or played on a computer, burned to a CD or transferred to other media. The built-in full playback function of the piano allows you to: pause, fast forward, rewind and repeat AB part.

* To record a CD, you may need software on the market.

MIDI recorder

This function allows players to freely record their performance in the CELVIANO Grand Hybrid's memory. This helps users to review their performance objectively to improve their playing skills. This complete playback function allows you to pause, fast forward, rewind, and repeat AB part during playback.

Music library

The "Music Library" of CELVIANO Grand Hybrid contains 60 piano music. The scores of these songs are already included, and CELVIANO Grand Hybrid also provides ideal learning functions. The left and right hands can be practiced separately. The tempo can be changed, and the AB part repeat function allows you to focus on a certain part of the song. Each piece has a preset tone, but the player can choose to use the tone of a Berlin grand piano, a Hamburg grand piano or a Vienna grand piano.

* Some scores are not available due to copyright issues.

Duet mode

The left and right keyboards from the middle can be set to the same range. The duet mode is convenient for two players to practice together, such as a parent and a child or a teacher and a student.

Overlay and split

The layering function allows the player to overlap two different tones, while the split function can separate the tones into lower and higher blocks.

Automatic shut-down

In order to save energy, CELVIANO Grand Hybrid will automatically shut down after 4 hours of stopping playing.

Ergonomic interface

CELVIANO Grand Hybrid is equipped with a simple and thoughtful control panel, which is convenient and easy to use. With a dedicated button, you can easily switch to the tones of a Berlin grand piano, a Hamburg grand piano or a Vienna grand piano.


Natural grand piano hammer action keys (use the same wood as the C. Bechstein grand piano)
Touch sensitive
5 sensitivity levels (heavy 2, heavy 1, normal, light 1, light 2), off
Sound source
AiR Grand Sound Source String Resonance, Damper Resonance, Open String Resonance, Dichotomous Resonance, Damper Noise, Pedal Action Noise, Key Action Noise, Off-Key Action Noise, Hammer Response, Lid Simulator, Off-Key Simulator
Maximum polyphony
256 years
35 built-in tones: Berlin Grand Piano, Berlin Grand Piano Soft, Berlin Grand Piano Bright, Hamburg Grand Piano, Hamburg Grand Piano Soft, Hamburg Grand Piano Bright, Vienna Grand Piano, Vienna Grand Piano Soft, Vienna Grand Piano Bright, Grand Piano Modern, Grand Piano Rock, Grand Piano Jazz, Grand Piano Pop, Grand Piano Dance, Bar Piano, Piano Pad, Electronic Piano 1, Electronic Piano 2, Electronic Piano 3, FM Electronic Piano, 60'S Electronic Piano, Harpsichord, Vibraphone, Strings 1, String 2, Synthesizer, Pipe Organ 1, Pipe Organ 2, Jazz Pipe Organ, Electronic Pipe Organ 1, Electronic Pipe Organ 2, Electronic Pipe Organ 3, Acoustic Bass Guitar, Percussion Bass Guitar, Electronic Bass Guitar
Digital effect
Concert hall simulator: 12 types, listening position settings: 1 player position, 3 listener positions; Chorus: 4 types, brightness: 7 levels, DSP: (default for some tones)
Built-in music
Concert performance mode (audio music): 15 pieces, music library (MIDI music): 60 pieces, grand piano sound demo songs: 6 pieces
Expanded music
10 pieces of about 900KB (each piece of up to about 90KB)
Teaching function
The right hand part is closed, the left hand part is closed
Beat: 0 to 9 (tempo range: quarter note = 20 to 255)
[MIDI Recorder] 2 tracks x 1 song, up to about 5,000 notes, real-time recording/playing
[Recording] Up to 99 songs, each about 25 minutes long (44.1 kHz WAV format)
Other functions
  • Preset temperament: 17 kinds
  • Top cover switch
  • Volume synchronization equalizer: 3 levels, off
  • Headphone mode
  • Set the number of scenes: 15 groups preset 10 groups user-defined
2 octaves (-12 semitones ~ 0 ~ +12 semitones)
Tuning control
A4 = 415.5Hz ~ 440.0Hz ~ 465.9Hz
Grand piano pedal system
3 pedals (damper, soft, sustain)
Half-pedal effect damper: continuous identification, 5 position levels
16 cm x 2 + (10 cm + 5 cm) x 2
Three-way six speakers
Amplifier output
30W x 2 + 20W x 2
Input/output terminal
  • USB to host, USB to device
  • Headphone/output terminal: 2 (stereo standard jack)
  • LINE IN: 2 (L / mono, R), standard jack
  • LINE OUT: 2 (L / mono, R), standard jack
Power requirement
AC adaptor (AD-E24500LW)
Dimensions (width x depth x height)
1,462 x 489 x 1,003 mm (not including music stand)
85.5 kg
Body color/surface
Black wood grain
Included accessories
Music stand, sheet music, piano chair, AC transformer
EAN code
4971850362166 years

Share this Product