ADVERTISEMENT

Let-Off Simulation on Digital Pianos

  • A let-off simulation is an important feature of mid- to high-end digital pianos that recreates a mechanical detail of acoustic pianos.
  • Just like acoustic pianos, digital pianos generate the let-off simulation mechanically. It gives the pianist a more precise control over their play.
  • The terms escapement (simulation/action) or let-off mechanism are often used instead of let-off simulation.
Let-Off Simulation and attack
(Image Source: Kawai)
ADVERTISEMENT

A special feature of many mid-range and high-end digital pianos is the let-off simulation, which gives advanced pianists very precise control over their play.

ADVERTISEMENT
ADVERTISEMENT

Piano beginners will probably not even notice whether a digital piano keyboard is built with or without a let-off simulation. In fact, the mechanism – while intercepting the key travel – is not an “obstacle” that requires a great deal of effort to overcome. However, the escapement and its position allow the pianist to play finely controlled nuances, especially during quiet passages.

Let-Off Simulation Kawai GrandFeel II
Let-off simulation on the Kawai GrandFeel II hammer action. The small action produces a slightly noticeable but clearly defined 'notch' sensation. (Image Source: Kawai)

How does the let-off simulation work?

The word “simulation” already indicates that it replicates a detail of the action of an acoustic piano. This detail comes from the modern double-escapement repetition action, which evolved from the first double-escapement action invented by Sébastian Érard in the mid-19th century.

The double-escapement action is a complex decoupling of key and hammer. Simply put, it ensures that the hammer is ready to play immediately after a note is struck, even before the key has fully returned to its resting position. There are two ways to trigger the note:

  1. The key is fully depressed. In this case, the full range of the key travel is used at once.
  2. The key is not fully released and is played from a slightly depressed point.

This is also known as a repetition action.

Hammer Action Simulation Kawai GrandFeel II
The impact of the hammer on the felt stopper simulates the striking of a piano string. (Image Source: Kawai)

How does the let-off simulation on digital piano work?

The let-off point is particularly noticeable when playing pianissimo and wanting to apply as little force to the hammer movement as possible. It hence allows you to strike the keys in a controlled manner. Even a short keystroke is enough to send the hammer quickly but less forcefully to the virtual string.

Let-Off Simulation, Escapement, Triple Sensor System

Product descriptions and manuals sometimes use the term escapement (action/mechanism) instead of let-off simulation or mechanism.

On a digital piano, the let-off point is created by an inconspicuous mechanical device. Here, too, you must overcome a small resistance located further down the key travel. A tripple sensor system (3 sensors), which scans the key travel, is important for transmitting the velocity values for Note On- and Note Off-action:

Action 1: The key moves completely from sensor 1 to sensor 2 – the sound is triggered, and the velocity measurement determines how forcefully the key is struck.

Action 2: The key is not released completely but stops somewhere in the key travel. Now the note is struck again (repeated), and sensor 3 transmits the data for the new velocity measurement.

ADVERTISEMENT

Related Articles

09.07.2025 · Learn Digital Piano Features: Understanding Digital Piano Technology

"All I want is to play the piano..." - a common phrase used by many beginners who are interested in a digital piano. Which are the most important digital piano features? Which ones are essential ...

22.02.2025 · Learn Piano Chords: Adele - Someone Like You

You don't have to be a professional pianist to play the piano chords for the song Someone Like You. And yet it is one of Adele's most successful songs. In that sense, Someone Like You ...

29.01.2025 · Learn Vintage Electric Piano: Iconic Sounds of the '60s, '70s and '80s

Originally invented as a portable piano replacement, electric pianos have become classics in their own right. Our love for vintage pianos encompasses the sounds of the '60s and '70s, especially originals like the Fender Rhodes ...

28.01.2025 · Learn Digital Piano vs. Acoustic Piano – What's the Difference?

Digital piano vs. acoustic piano—you can obviously hear the difference, right? After all, these are two different instruments, even though both are designed for playing the piano. But is it really that simple? Is it ...

10.01.2025 · Learn Music Technology Explained: What Is a DAW?

A digital audio workstation, or DAW, is the heart of making music with a computer. DAWs are available for all major operating systems and offer everything you need for modern music production: Audio and MIDI ...

06.12.2024 · Learn Cristofori and the Pianoforte

While his name may not be well known, anyone who plays the piano should have at least heard of him. After all, when we play the piano, we all want to feel Bartolomeo Cristofori's groundbreaking ...

30.11.2024 · Learn Velocity Curves: Customizing the Keyboard's Touch Sensitivity

You can customize the playing response of your digital piano by adjusting its touch dynamics. What requires a piano technician's expertise on an acoustic piano can be done in just a few steps on a ...

10.10.2024 · Learn The Half-Pedal Technique on Acoustic and Digital Pianos

On many digital pianos, the sustain pedal is a simple on/off switch. Although this function is essentially similar to the damper pedal on a real piano, there are many nuances between the "pedal pressed/not pressed" ...

29.06.2024 · Learn Piano VST: Play the Piano with Your Computer

Playing the piano using a piano VST - a clever and seemingly inexpensive solution. However, considering that you'll need a lot more than just the software, it's not that much cheaper than a digital piano, ...

16.04.2024 · Learn What's an Ivory Feel Keyboard?

For a more authentic feel, electric piano keyboards - usually made of plastic - have certain acoustic piano characteristics. An Ivory Feel keyboard ensures that your fingers have a good grip on the key surfaces. ...

03.09.2021 · Learn Hammer Action Keyboard for Digital and Acoustic Pianos

Hammer action made dynamic piano playing possible for the first time. Invented in the 18th century by the Italian instrument maker Bartolomeo Cristofori, the hammer action keyboard was continuously enhanced. It created the piano touch ...

18.08.2021 · Learn Graded Hammer Action: Keyboard with Scaled Weighting

What makes piano touch authentic? As an electronic alternative to the acoustic piano, a digital piano should at least have very similar playing characteristics. An important element is a graded or scaled hammer action with ...