Where is the “Use audio port for” menu?
The Help Center says: "If your Mac has separate ports for input and output, the sound input port has a microphone icon. If your Mac has only one sound port, it has a headphones icon but can be used both input and output."
as well as: "If your Mac has only one sound port, the “Use audio port for” menu is available. Choose Sound Input if you’re using an external microphone."
I tried connecting an external microphone to the sound port that can be used both for input and output, but I could not find the “Use audio port for” menu in the Input pane of Sound preferences and therefore was unable to use the external microphone for sound input. Is there anything I might have missed?
MacBook Pro (Retina, 13-inch, Late 2013), OS X Mavericks (10.9.1)