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Disabling sound output devices (e.g. Internal Speakers) in OS X

Since my Cinema Display is both connected through mDP and USB, I can (stupidly enough) both choose “LED Cinema Display” or “Display Audio”. Also, I never use the internal speakers since they sound ...
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Can you play sound out of Macbook Pro & Apple Cinema Display Simultaneously [duplicate]

Possible Duplicate: Can I get sound out of both iMac and attached Thunderbolt Display? I have a macbook pro 2009 model, and a 24' apple cinema display. When the USB is connected the audio ...