You'll only be able to select multi-channel configurations based on the number of total streams in your audio device, so four speakers will only allow you to set stereo and quadraphonic configurations, for example. OS X Audio Units are equivalent to DirectX plug-ins in Windows, providing a non-application-specific format for audio plug-ins that means developers can produce one plug-in and have it work without alteration in applications from multiple vendors. Already own a copy of DVS? You can also select the clock source where the device supports different clock sources underneath the 'Properties For' heading, although this will be greyed out if an Aggregate device is selected — even if the master clock source for that Aggregate device can be selected from different clock sources on the corresponding hardware device. One of the neat things about Aggregate devices is that it's possible to create multiple Aggregates on the same system comprising different combinations of the audio devices attached to your computer, for different possible tasks. For more info google it.
What should I do? When installing a major Mac OS update over an existing one not using a clean install , or when using Apple's Migration Assistant to transfer files and preferences from one Mac to another, you will often run into trouble with drivers not working properly, authorizations being lost or corrupted etc. When files are mixed between systems, or are transferred to a system they weren't specifically intended or created for, difficulty is always a possibility. If your MIDI devices don't work properly after an update or migration.
Often, after an update or migration, you will need to "refresh" certain MIDI devices. If the above steps do NOT resolve your issue Support Knowledge Base.
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