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What is the audio line-in impedance? - Apple Community
https://discussions.apple.com/thread/306539
If it is, then it has SPDIF ports instead of the usual minijacks of older Powerbooks. You can tell by opening Apple menu -> About This Mac -> More Info -> selecting Audio (Built-in). If SPDIF is mentioned, then you have Optical in and out. If it is, then I found this interesting article which may help you out:
Google Answers: line in mic for mac powerbook
http://answers.google.com/answers/threadview/id/482464.html
It connects to your powerpook by usb, simply change your input mic selection in system preferences and then when you go to imovie, simply select audio and click the litttle record button to record...
Garageband 3.02, Powerbook G4 and no Audio Line In ...
https://forums.macrumors.com/threads/garageband-3-02-powerbook-g4-and-no-audio-line-in.204429/
Found A Fix: No sound with Line In Recording First time posting a comment to any forum...ever. But I found a fix that works for me and hope it helps others. 1) Apple > System Preferences > Sound > Input > Select Line IN 2) Garage Band > File > New > Create a new project 3) Track > New Track > Select "Real Instrument Track". Create.
Low End Mac’s Compleat* Guide to 12″ PowerBooks
https://lowendmac.com/2014/low-end-macs-compleat-guide-to-the-12-powerbook/
audio line-in and audio line-out ports 12″ 1.33 GHz PowerBook G4 (Mid 2004) PowerPC 7457 (G4) 1.33 GHz with 1 MB Level 2 cache Combo (DVD-ROM/CD-RW) drive or 4x SuperDrive (DVD-R/CD-RW) 256 MB of 333 MHz DDR SDRAM, expandable to 1.25 GB Nvidia GeForce FX Go5200 graphics card with 64 MB of VRAM internal Bluetooth 1.1
PowerBook G4 12-inch Getting Started
http://www.wedophones.com/Manuals/AppleComputer/PowerBook%20G4%2012-inch%20(1-33GHz)%20Getting%20Started.pdf
Record sounds directly on your PowerBook hard disk with this built-in microphone. Built-in stereo speakers Listen to music, movies, games, and multimedia. Function (Fn) key Press and hold this key to activate the function keys (F1 to F12). Sleep indicator light A white light pulsates when the PowerBook is in sleep. Display release button
SOLVED: Is the Line-in port bad? - PowerBook G4 …
https://www.ifixit.com/Answers/View/11231/Is+the+Line-in+port+bad
I have a MAC's microphone and a PC's mic, the connector is all 3.5 mm, but the MAC's is longer than the PC's connector and can not plug complete in to the Audio Line-In port of the PowerBook G4 867 12" . The internal microphone is not disconnected when the external plugging in. The external mic is not work, but built in mic is work still.
Audio line-in port does not work - Apple Community
https://discussions.apple.com/thread/890637
Plug in the headset, launch Audio MIDI Setup, select Logitech Input and set the appropriate Format and levels, select Logitech Output and do the same. Close Audio MIDI Setup. It didn't work. It's just called 'Built-in Input' and doesn't mention Logitech anywhere, by the way.
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