Logic Pro X

Suppresses the popup to download additonal sound content on launch. Yes, in fact, 'Download' is spelled 'Dowload' in the preference key.

Enables destructive audio editing, and advanced configuration options for audio editing experts.

Allows experts to create new, and edit any functional detail of existing control surface systems.

Enables advanced editing functionality, including: aliases, track reassignment, historic tuning scales, and the Tempo Interpreter.

Allows signal flow control and real-time processing of MIDI input and output streams in the Environment.

Enables the full feature set of the Score window for notation experts.

Enables all features for surround audio productions, and requires a surround speaker setup for monitoring.

Configures whether Show Advanced Tools is enabled.

Configures Logic's startup behaviour.

So long as the integer value of this preference is set equal or higher to the value produced in the user-level plist after launching the app and acknowledging the "What's New" prompt, this will prevent the "What's New" prompt from appearing.

Set to 0 to disable Quick Help Mode overlays.