Among the sacrifices Apple had to make to fit the Pro hardware into a 13″ unibody case was the loss of the Line-In port. All MacBook models aside the 13″ MacBook Pro have two ports–one dedicated to sound input and one for sound output. With the new MacBook Pro 13″ model, Apple combined these ports into one single “audio” port which performs both functions, albeit one at a time.

True to Apple’s nature, they’ve made switching between the functions easy to do. Simply go to the Sound pane in System Preferences and change it from the dropdown box:

Sound Preferences

Simple, but annoying. The other day I had my electric guitar and wanted to amp it through my friend’s MacBook Pro 13″ but I ran into this problem: if I plugged my guitar directly in using the audio port as Line-In I couldn’t connect his laptop to a sound system–meaning I was forced to use the Mac’s built-in speakers to hear my guitar. Lame! Obviously this could have been remedied by using an external audio interface, but that’s still inconvenient.

Sigh.

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