Apple
Mac
iPad
iPhone
Watch
AirPods
TV & Home
Entertainment
Support
Where to Buy
Quick Links
If you forgot your Apple ID password
If you forgot the passcode for your iPhone, iPad, or iPod touch
View, change, or cancel your subscriptions
Update iOS on your device
Contact Apple Support
Logic Pro User Guide
Open Menu
Close Menu
Communities
Sustain
An envelope parameter that determines the steady amplitude level when a key is held down.
