Pioneer TRAKTOR PRO CDJ-350 Connection Manual page 10

 When Using the Mac OS X 10.6.X
1
Connect the Multi Player (or players, if more than one are to be connected) to the computer with the use
of a USB cable.
2
Start up [AUDIO MIDI Settings] from the [Applications]–[Utilities] folder.
3
Click [+] on the [Audio Device] screen to add the new Device settings.
4
Select the added Device setting, and then add a tick to [CDJ-350] to it for the required number of Multi
Players.
5
Select the Device setting created with procedure
the TRAKTOR PRO.
6
The Multi Player will be automatically set up at the audio output device.
If the settings are not made automatically, set the necessary parameters manually with [Traktor] 
[Preferences...]  [Audio Setup]  [Output Routing].
4
with [Traktor]  [Preferences...]  [Audio Setup] on
10