⌃Control =
Raise the volume of the selection by 1 dBWith macOS in Spanish, the default command set uses ⌃'.
⌃Control -
Lower the volume of the selection by 1 dBWith macOS in Spanish, the default command set uses ⌃¡.
⌥Option S
Solo the selected clips
⌃Control S
Expand the clip to show its audio separately
⌃Control ⇧Shift S
Detach the audio into a connected clip
⌃Control ⌥Option S
Expand or collapse the audio components
⌥Option T
Add a crossfade at the audio edit point
⇧Shift ⌘Command M
Match the sound of the selection to another clip
⌥Option ⌘Command E
Add the default audio effect
⇧Shift ⌘Command 8
Show or hide the audio meters