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The type of computer is not relevant. This turntable provides output at nominal "line level" and can be connected to your MacBook with a properly shielded audio cable through the audio input.
For best results, you might want to disable automatic-gain-control (AGC) in the "Sound" preferences pane in the "System Preferences" panel, and set the level manually such that the input does not overload.
As I mentioned above, the signal level is nominally "line level", and that can mean very different things depending on context. You might find that using a passive volume control (potentiometer) between the turntable and the computer's analog-to-digital converter can greatly improve the quality of sound.
Usually those terminals are always on, and the only thing that you can change about them in the menu is audio out fixed(always same level) or variable(level controlled via remote).
There might also be a speakers off option in the menu,try it and in your case it might be the switch between internal and external sound.
And in the last resort look at the back for a manual switch, otherwise check for faulty cables.
You also might have a problem with the set.
Hope this will help. Good luck
Volume and video levels for live broadcast, as well as satellite feeds are preset at a master control panel prior to broadcasting. TV commercials are pre-recored via satellite feeds, on seperate equipment, where audio and video levels are set manually by a technician. These manually set levels are very difficult to match, since the levels on the master control panel change. When the master control technician switches control to mark, a robot, mark loads the commercial and it is broadcasted, hence the different audio levels.