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Key-Off Effect on Digital Pianos

  • The key-off effect enhances the realism of digital piano sounds and software pianos. This rather subtle sound detail occurs on acoustic pianos when the dampers touch the strings.
  • Experienced pianists make use of the release speed to control the decay.
  • The sound of mid-range digital pianos already includes the key-off effect. High-end digital pianos implement a more nuanced sound, which also takes the resonances of aliquot and duplex strings into account.
Shigeru Kawai Motiv: Key Off
Image Source: Kawai
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The key-off effect simulates the characteristic sound of the dampers touching the piano strings. On digital pianos, key-off samples reproduce this sound behavior. It should not be confused with the mechanical hammer noise (fallback noise) that is also included in many piano simulations.

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Without the key-off effect, the decay of a digital piano lacks authenticity and expression.

Key-Off Samples & Piano Sound?

In most acoustic instruments, damping stops the vibration of a tone. On an acoustic upright or grand piano, this happens mechanically when the dampers touch the strings. Many factors affect the final result here: For example, when you play the note loudly and staccato, this process sounds different than when you hold it note for a long time and release it slowly.

The key-off moment is a playful element that pianists control in many different variations through the release speed. If we look at the world of electronic musical instruments, we find that the Release Velocity function represents this element. In addition, this function is also used to vary the key-off samples of digital pianos or software pianos in a controlled manner.

The dampers touching the strings produces a characteristic sound.
When a note is released, the speed at which the dampers touch the strings affects the sound. (Photo: Jörg Sunderkötter)

Without the key-off effect, the sound of a digital piano lacks authenticity and expression. When you’re playing a piano piece, the missing details will make your digital piano sound somewhat colorless. However, the key-off function is just one of many sound details that sound generators of modern digital pianos and software pianos take into account. On most digital pianos, you can find all of these settings in one special section and adjust them individually: Virtual Technician (Kawai), Piano Designer (Roland), Piano Room (Yamaha Smart Pianist).

Most mid-range digital pianos already feature the key-off effect. Higher-priced digital pianos implement a more nuanced sound, which also takes the resonances of aliquot strings and duplex scale into account.

How the Key-Off Effect Works

Technically speaking, key-off samples are release samples, a technique developed in the samplers of the 80s and 90s. Its original purpose was to allow for a more realistic reproduction of the specific decay of acoustic instruments. Normally, playing a key triggers a sound; with key-off samples, the opposite is true: the MIDI function Note Off triggers the key-off samples. The intensity with which this happens is measured by the velocity at which the keys are released. The resulting value is called Release Velocity.

Smooth Release

On Yamaha digital pianos, you can find the term Smooth Release in addition to the key-off effect. This technique is essentially a part of the key-off effect that varies the key-off sound depending on how quickly you release the keys. On an acoustic piano, the decay phase is quite dynamic, depending on whether you play short notes staccato or portato, or release the note very gently. The velocity and duration of the note must also influence the key-off effect, otherwise we would perceive the decay of the notes as unnatural. Yamaha digital pianos with Smooth Release can simulate this sound behavior very authentically.

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