What is the "Audio line in" port for?

I have a microphone headset but plugging the mic cord into the audio line in port does nothing. Similarly, when I tried plugging a cable from the "tape out" of my audio amplifier into that port for dubbing purposes, nothing happened. In both cases I can achieve what I want using an iMic and a USB port. So what's the audio line line port for? How can I use it?

Check your Sound settings in system preferences and audio midi set-up, Brian. It may be that you have it set to accept sound in through USB at present. Another possibility is that the port has "stuck" on "optical input".
Cheers
Rod

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Solved!
Go to Solution.

Hi Kirco,
I have some more information for you :-)
I haven't been able to speak to the developer who is the most familiar with TIO programming since he's out of the office, but I have come across his notes from when he was writing support for the DAQmx driver.
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TB_0_LevelEdgeReg :: Offset 0x660
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All of the other bits should be set to 0b0.
Unfortunately, I'm unable to test these statements since my test machine is currently being used for another research project. Please let me know what happens if you decide to test.
Joe Friedchicken
NI VirtualBench Application Software
Get with your fellow hardware users :: [ NI's VirtualBench User Group ]
Get with your fellow OS users :: [ NI's Linux User Group ] [ NI's OS X User Group ]
Get with your fellow developers :: [ NI's DAQmx Base User Group ] [ NI's DDK User Group ]
Senior Software Engineer :: Multifunction Instruments Applications Group
Software Engineer :: Measurements RLP Group (until Mar 2014)
Applications Engineer :: High Speed Product Group (until Sep 2008)

Audio line-in port stopped working properly

I started to have a perplexing problem that I narrowed down to the audio in-put port on my Mac Pro (MacPro3,1). It was working fine then the sound level increased and the quality became distorted (like a "fuzz base" but affecting all sounds).
I was in the process of digitizing records, and believed the record played broke. So I got a new record player (audio-technica AT-LP120-USB). The same thing occurred with the audio in-put port, so I switched to the USB port and the audio was fine. I also checked with music already on my HD and it played fine. Consequently it has to be the in-put line port and/or a software issue.
I checked BBs but could not find a similar issue.
Any suggestion? Thanks in advance.

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What is the "Audio line in" port for?

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