Final answer:
The keyboard sends out a message to the envelope generator to begin its attack, initiating the first phase of the sound's amplitude envelope. This is a key concept in electronic music production, where MIDI messages control various aspects of sound.
Step-by-step explanation:
When referring to the interaction between a keyboard and an envelope in a musical context, we often use terms associated with MIDI (Musical Instrument Digital Interface) and synthesizers. The keyboard sends out a message to trigger the envelope's attack, which is the initial part of a sound's amplitude envelope. This message tells the envelope generator in a synthesizer to start the attack phase, which quickly raises the sound's level to its peak at the beginning of a note. After the attack phase, the sound may enter other phases such as decay, sustain, and release, collectively known as ADSR (Attack, Decay, Sustain, Release).
The concepts of MIDI and ADSR are fundamental to electronic music production and sound design, with MIDI being a protocol that allows electronic musical instruments and computers to communicate through messages. This enables different types of messages to be sent, each corresponding to different commands and functions within a musical setup, ensuring precise control over various parameters. It's essential to understand these messages and how they relate to the sound generation process.