When Show Advanced Tools is selected in Advanced preferences, the Audio Editing pane is available with the following preferences:
Crossfade Time slider: Determines a default time value for all crossfade operations in the Tracks area.
Crossfade Curve slider: Determines a global curve type for all crossfade operations in the Tracks area.
“Scrubbing with audio in Tracks area” checkbox: When selected, you can scrub audio regions in the Tracks area using the Scissors or Solo tools.
Maximum Scrub Speed pop-up menu: Sets the maximum scrubbing speed. You can choose between normal and double playback speed.
Normal: The normal playback speed is used for scrubbing.
Double: The scrubbing playback speed is twice as fast.
Scrub Response pop-up menu: Sets the reaction time for audio scrubbing. Your choices are Slow, Normal, Fast, and Faster.