Aftertouch

Definition

Aftertouch refers to a MIDI control signal generated by a keyboard or MIDI controller that detects pressure applied to the keys after they have been pressed down. This additional pressure can modulate various aspects of sound, such as vibrato, volume, or effects, enhancing expressiveness in musical performances. Aftertouch adds a dynamic layer to sound creation, allowing musicians to manipulate sounds in real-time during their performances.

5 Must Know Facts For Your Next Test

1. Aftertouch can be divided into two types: channel aftertouch, which affects all notes played on a channel, and polyphonic aftertouch, which affects individual notes based on their specific key pressure.
2. Many synthesizers and MIDI controllers implement aftertouch to allow for greater expression and control over sound manipulation.
3. Aftertouch is often used creatively in electronic music to enhance live performances by adding dynamics that wouldn't be possible with just note-on messages.
4. The implementation of aftertouch can vary between devices; not all MIDI keyboards support it, and the way it responds can differ significantly.
5. When programming aftertouch in a DAW, users can assign it to various parameters, including filter cutoff frequency and effects parameters, expanding its utility in sound design.

Review Questions

• How does aftertouch enhance expressiveness in musical performances compared to traditional note-on messages?
  • Aftertouch enhances expressiveness by allowing musicians to manipulate sound in real-time through pressure applied to keys after they are initially pressed. Unlike traditional note-on messages that only indicate when a key is activated, aftertouch provides additional control over various parameters such as volume and modulation. This capability enables performers to create more nuanced and dynamic sounds, adding depth and emotion to their music.
• Discuss the differences between channel aftertouch and polyphonic aftertouch and their implications for sound design.
  • Channel aftertouch affects all notes played on a single channel when pressure is applied, resulting in a uniform response across all notes. In contrast, polyphonic aftertouch allows for independent control of each note's pressure, enabling unique modulation for every sound. This distinction impacts sound design by giving musicians greater flexibility; they can create intricate textures and variations in sound that would be impossible with only channel aftertouch.
• Evaluate the role of aftertouch in modern music production and how it influences both studio recording and live performances.
  • Aftertouch plays a significant role in modern music production by providing an additional layer of expression that enhances both studio recordings and live performances. In studio settings, producers can use aftertouch to automate effects and modulation changes, creating more dynamic tracks. During live performances, musicians can engage audiences with expressive playing that reacts to their touch, making each performance unique. This capability helps bridge the gap between digital technology and human expression in contemporary music.

Related terms

MIDI: MIDI (Musical Instrument Digital Interface) is a standard protocol that allows electronic musical instruments, computers, and other devices to communicate and synchronize with each other.

Velocity: Velocity is a MIDI parameter that represents the speed at which a key is pressed, influencing the volume and timbre of the sound produced.

Modulation: Modulation refers to the technique of varying one or more parameters of a sound wave, such as pitch or amplitude, over time to create changes in tone or texture.