"This update delivers improved general stability and compatibility.
Issues addressed with 9.1.2 include:

• Improved compatibility with 6 and 12-core Mac Pro systems
• Support for iOS control surface apps that utilize the OSC protocol
• REX files now supported in 64-bit mode
• Improved compatibility with select Audio Unit plug-ins

The update is recommended for all users of Logic Pro/Express 9.
System requirements: OS X 10.5.8 (or later)"

For detailed information on this update, see Logic Pro 9.1.2: Release notes and Logic Express 9.1.2: Release notes.

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