So i’ve just started looking at recording my electric guitar in garageband on my new macbook. I didnt know you had to “enable” the audio-in to get it to work directly with the guitar, the sound is going to be weak but thats another issue!
Steps:
1. Connect your guitar cable to the audio line in jack on your Mac using a 1/4-inch to 1/8-inch adapter.
2. Connect your headphones to the output jack. (Don’t confuse the input and output jacks!)
3. Open System Preferences.
4. Click on the Sound icon.
5. Click the Input tab.
6. Select “Line In” in the “Choose a device for sound input” list.
7. Open your recording software.
8. Create an audio/real instrument track (not a MIDI/virtual instrument track).
9. Select Channel 1&2 as your input.
10. Strum a loud chord. Chances are the guitar sound will seem quiet, even with the headphone volume turned up, and the input level meter will probably remain in the lowest part of its range.
(Taken from http://www.apple.com/pro/techniques/connectingguitar/)
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