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Bypass, remove, or rescan Audio Units plug-ins in Logic ...
https://support.apple.com/en-us/HT201199
If you can't find a recently installed plug-in in the Plug-In Manager in Logic Pro or MainStage, try resetting all Audio Units using the Logic Pro Plug-in Manager. Resetting Audio Units in Logic Pro also resets them for MainStage. Choose Logic Pro > Preferences > Plug-In Manager. Click Full Audio Unit Reset. Close Logic Pro, then reopen it. Logic Pro rescans all …
Logic Pro 9 hangs when scanning Audio Uni… - Apple Community
https://discussions.apple.com/thread/2641927
I then get a progress bar and a "Scanning Audio Units (finalized 0 of 40)" box with an abort option. The abort option doesn't do anything but I can still quit Logic using the cmd+Q shortcut. So far I've tried - 1.) Booting into Logic without Core Audio and opening AU manager. It starts up but for some reason the manager simply refuses to open.
Using Plug-ins from Other Manufacturers - Apple
https://help.apple.com/logicpro/mac/9.1.6/en/logicpro/usermanual/chapter_10_section_13.html
Choose Logic Pro > Preferences > Audio Units Manager in the main menu bar (or use the Audio Units Manager key command). Manually Enabling Plug-ins Audio Units plug-ins that fail the validation test can be manually activated by selecting the checkboxes in the Logic column—but be aware that these plug-ins can cause problems.
Logic Pro 9 - Technical Specifications - Apple
https://support.apple.com/kb/SP673?locale=en_US
Destructive sample editing using built-in or external sample editor. Mixer. Up to 255 audio channel strips. Up to 255 software instrument channel strips. Up to 255 auxiliary channel strips. 64 busses. Each of the above in mono, stereo, or surround (with 1-8 audio channels). 15 inserts for internal or Audio Units effect plug-ins.
Integrating Outboard Hardware With Logic - Sound on …
https://www.soundonsound.com/techniques/integrating-outboard-hardware-logic
With all your interfaces connected (and any necessary drivers installed), open Audio MIDI Setup and select the Audio Tab. Then select 'Open Aggregate Device Editor' from the Audio menu. Click on the '+' button to make a new Aggregate Device and …
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