An envelope defines the loudness profile of a particular sound, in conjunction with the sound's level. All sounds must have a corresponding envelope to be listenable.
The envelope editor, shown below, lets you select a current envelope that is applied to newly created sounds and can be assigned to selected sounds. The envelope editor also lets you create new envelopes, edit or delete existing envelopes. The current envelope and its name is shown at the top of the envelope editor, while the list below shows all available envelopes.