Logic Pro and MainStage 64-bit mode FAQ
Logic Pro 9.1 and MainStage 2.1 can be used in 64-bit mode on Mac OS X v10.6.2 or later. Here are some frequently asked questions about using Logic Pro and MainStage in 64-bit mode.
Logic Pro 9.x, MainStage 2.0
How do I use Logic Pro or MainStage in 64-bit mode?
- Quit Logic Pro or MainStage if it is running.
- Navigate to the Logic Pro or MainStage application in the Applications folder.
- Choose Get Info from the Finder File menu.
- Disable the option to "Open in 32-bit mode" to open in 64-bit mode.
What advantages are there to using 64-bit mode?
Since EXS24 is memory intensive, should I be running Logic in 64-bit mode to get the number of instances I may need?
Do Logic Pro or MainStage perform better in 64-bit mode?
Can I use my existing Audio Unit (AU) plug-ins in 64-bit mode?
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.
The 32-bit Audio Unit Bridge has the same 4GB memory address limit as any other 32-bit application. Also, it is only possible to display and edit one 32-bit plug-in at a time.
Audio Unit plug-ins which are 32-bit only will appear in the channel strip plug-in insert menu under "Audio Units (32-bit)". Audio Unit plug-ins which are 64-bit will appear in the normal location in the menu. Check with your favorite third-party plug-in developers for updated information on the availability of 64-bit versions of their plug-ins.
Is there a performance penalty when using the 32-Bit Audio Unit Bridge?
Should I disable Virtual Memory in the EXS24 when running Logic in 64-bit mode?
Do Logic Pro or MainStage sound different in 64-bit mode?
Is there a way to tell whether I'm in 64-bit mode?
* While most 32-bit plug-ins should work with the 32-bit Audio Unit Bridge solution, not all plug-ins may be compatible.
For more information about running Logic Pro in 64-bit mode, see this article.
For more information about running MainStage in 64-bit mode, see this article.