A region can be manipulated in a number of ways; gain, trim and fade.
Volume - duck
Shift + ⌘ + arrow up/down “Duck” is typically used for “ducking” music under narration. This can also be used for ambient beds or voice over
Volume - bedding
Shift + ⌘ + arrow up/down “Audio bedding” is typically used for “bedding” ambience under a narration or interview
⌘ + F“Fades” are used for making smooth transitions from one piece of audio to another - or for gently bringing in ambience or music.
Fade - slope
Shift + Drag“Fade slope” is used to make a more gradual fade.
Fade - multi regions
⌘ + F“Fade over multiple regions” is used to create a single fade over small regions. This could be ambience or edited music.
Fade - cross fade
⌘ + F“Cross Fade” is used for making a transition from one sound to another on the same track.
Fade - cross fade point
⌘ + mouse“Cross Fade point” is the cross section of the fade. It can be moved to fit the fade point better.
Fade - multitrack
⌘ + F“Multi track Fade” is used for adding the same fade for more than one track.
Selection - remove
EscClear any selection by pressing the ESC key or double-clicking in a empty area in the workspace