Apple Upgrades Logic Pro, MainStage to 64-Bit

Apple has released Logic Pro 9.1 and MainStage 2.1 bringing 64-bit compatibility for users running Mac OS X 10.6.2 or later.

What advantages are there to using 64-bit mode?
The main advantage is that you can address vast amounts of memory. With 64-bit mode, the application memory is not limited to 4GB as with 32-bit applications, so there is essentially no practical limit by today's standards. As a result, all the installed memory that is not needed by the OS is available for use by Logic Pro or MainStage, which can be meaningful if your Mac has more than 4GB of memory installed. This larger amount of memory allows you to run far more instances of memory intensive plug-ins, such as sample-based software instruments.

To make the transition to 64-bit easier, both Logic Pro and MainStage are still able to access 32-bit-only Audio Unit plug-ins while in 64-bit mode by using a utility application called 32-bit Audio Unit Bridge. This application opens automatically whenever a 32-bit-only Audio Unit plug-in is accessed. The 32-bit Audio Unit Bridge hosts all currently used 32-bit-only Audio Unit plug-ins and runs alongside Logic Pro or MainStage to provide access to the plug-ins being used.


If you would like to open Logic Pro or MainStage in 32-bit mode you can do this by selecting the application in the Applications folder. Choose Get Info from the Finder File menu then select the option to "Open in 32-bit mode".

Hit the link below to see the release notes.

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