Audio MIDI Setup Issue -- "Thru" checkbox greyed out

I received my new PowerBook (DL Superdrive) last week and transferred my files from my old PB (the final 1GHz Titanium model) over the weekend. On my TiBook, I used to plug an analogue radio into the Line In port and Apple Pro speakers (via an iFire) into the Headphones port. I then ticked the "Thru" checkbox alongside the M(aster) Volume Slider in the Audio Input section of Audio MIDI Setup (even in Tiger, once I worked out where the checkbox was -- see <http://discussions.apple.com/message.jspa?messageID=740942>) to listen to the radio through the external speakers and control output volume using the keyboard's volume & mute keys.
Audio MIDI Setup on the new Powerbook has some differences, however, including:
1. In the Audio Input section, the M(aster) Volume Slider IS NOT greyed out, but the "Thru" checkbox on this line IS greyed out., and the 1 & 2 Volume Sliders ARE also greyed out.
2. Clock Source is "Internal Clock" rather than [greyed out] "Default".
The first of these differences has left me unable to set up my audio as I used to. Instead, I've had to run a non-Apple audio application, LineIn, in order to achieve the same result. The trouble with this is that I've also experienced the audio stuttering loop described in <http://docs.info.apple.com/article.html?artnum=302978>, possibly as a result of this app running.
Two questions: First, does anyone have any idea how to get Audio MIDI Setup running on the new Powerbook as it did (does) on the TiBook, so that I can dispense with LineIn?
Second, do any of the other Powerbook owners with the audio stuttering problem have similar issues with Audio MIDI Setup -- is it a common factor/symptom/cause?
PB G4 15" 1.67GHz DL SuperDrive Mac OS X (10.4.4)

The audio stuttering issue was resolved by an OS X update shortly after I posted this message, but I never did resolve the other issue, and continue to use LineIn to this day (now on a MacBook Pro C2D.

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ok here is my first problem with this setup
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why is 5.1 greyed out ?in audio midi setup ?
i am using my mac to create multimedia content and knowing how the sounds created will be heard helps me a lot..
i have invested a lot (3 years savings in this mac) and i wouyld very much appreciate all your help..
i also purchased a griffin hdmi port which connects to my tv but the audio is still stereo..
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Hello John, I figured it was a signal issue. All the speakers fire and the sound is great. I was running the speakers thru a Dell PC with a Creative X-Fi Elite Pro, THX Certified, 7.1 soundcard using a fiber optic from the Mac Pro to the Z906's, it worked great until the Dell died!!! When I bought the soundcard from Creative I also bought the GigaWorks S750, THX Certified, 700 watt, 7.1 speaker system, used the speakers for 11 years and then the woofer/amp said "I QUIT" Creative quit making the speaker system and the sound card. The satellite speakers from the Creative GigaWorks speaker system still sound great (rated at 78 watt each) and are a little better speaker than the one's that came with the Z906 and the wattage from the 906 is sufficient to drive the satellites without any distortion. Thank you for addressing my issue, you confirmed what I suspected all along, just needed to hear it from someone with the same setup.
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Audio Midi Setup - Configure to enable line-in "thru"

Hello,
I have an external audio device connected to my iMac via the line-in interface. I would like to be able to listen to this device without having to start an audio editing application.
I noticed in the "Audio MIDI Setup" under the "Audio Devices" tab, there are checkboxes at the bottom for "Volume Slider" for Mute and Thru.
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<http://rogueamoeba.com/freebies/>

I can't check mute or thru in audio midi setup!

Hi all!
I'm new so thanks for checking out my post. My issue is in regards to a problem with my audio preferences. I can't check "mute" or "thru" on my audio preferences (in audio/midi setup) for the line in and internal mic. I think they are leading to problems in logic with audio being recorded as bleed.
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Many audio audio input devices do not support Mute or Thru. Any recording applications should have ways of selecting the audio inputs to use, other than just reducing the levels of unwanted inputs.

How do I get my Built-in Mic to work in Audio MIDI setup, grayed out 1

My iMac is over a month old, and the first week I had it I tried to talk on Skype with a friend. My mic wouldn't work, and after making an Apple Care appointment with a local Mac store last weekend, we found out that the iMac DOES hear me, Dictation works with my voice, but for some reason Skype won't pick me up. Another program I sometimes use is Livestream Procaster, and neither pick up audio from me, oddly though they do pick up finger tapping on the desk, which is no further away from the computer than I myself am.
I Googled this issue with Skype and I found this page:
http://community.skype.com/t5/Mac/Apple-IMAC-Internal-Microphone/td-p/305172
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I have a screen capture of my window as well:
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I'm talking with a friend, and he says I'm muffled, and he can't understand me but can hear that I'm talking. When I turn on dictation to record what I'm saying he says I come through crystal clear.
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Audio MIDI Setup not remembering settings on startup

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The Audio MIDI Setup does not remember the 'Default Output' as 'Aggregate Device' and although 'Aggregate Device' is shown in the Properties For: field, only the 'Audio Input' area is shown.
Changing or re-selecting the Sample Rate under 'Format:' results in 'Aggregate Device' appearing in the 'Default Output:' field and the 'Audio Output' area showing the configuration.
I have to perform these steps every time I startup. I had the same behavior on my previous MacBook with identical specs but a different build week.
Also, correct me if I'm wrong, but Apple has absolutely no way to e-mail technical support queries unless you purchase that 'feature'? You have to call them with each 'bug' or technical difficulty?
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Ah, Ok. Turns out the issue I described only occurs when there's an optical digital cable plugged into the output at startup.
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Audio MIDI setup not allowing aggregate device

I recently upgraded to a mac pro, and transferred everything from my old mac via firewire..
On my previous computer, using my aggregate device (Roland Fantom + Built-in output + built-in input) was no problem. I would simply choose in Logic my aggregate device under the core Audio preferences, and I could play logic software instruments with the roland keys, record audio through the roland, and play it back through the built-in line output no problem..
Now, on my mac pro, I can't do this because the aggregate device I created on my previous computer is not showing up under the devices pull-down menu in the core audio preferences in logic, and I cannot create a new aggregate device on this computer, as a matter of fact I cannot even seem to delete the old one... when i click the plus or minus (+/-), the blue shade highlighting the selected audio device just goes straight to the device at the top of the list (which happens to be built-in mic). it does not even allow me to deselect or select any checkboxes within the existing "9/25 aggregate".. when I try it just makes the devices listed in that window wiggle...
I have attached a screen shot of the Audio Midi setup screen (where one should be able to create aggregate devices)
Please let me know if you know what could be causing this..

Ojan36 wrote:
Could uninstalling and reinstalling Logic completely possibly fix it? I guess that would be unlikely because the audio MIDI Setup window is OS X, unrelated to Logic..
Correct.
when i click the plus or minus (+/-), the blue shade highlighting the selected audio device just goes straight to the device at the top of the list
This is one of the reasons why I am still suspecting some kind of permissions problem, even though you said this user has Admin privileges. I suspect a permissions problem because the symptom you described ("the blue shade highlighting the selected audio device just goes straight to the device at the top of the list") is exactly what happens if you do not have Admin privileges and you press the + button.
I think this issue has to do with the fact that there was not a clean install of snow leopard
I agree. My theory is that something about the way you moved items to this machine led to a permissions problem, and this permissions problem is causing AMS (Audi MIDI Setup) to behave the way you see.
I recently upgraded to a mac pro, and transferred everything from my old mac via firewire..
I know you connected via FireWire, but how did you control what was being transferred? Did you use Migration Assistant, or some other method?
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You have not mentioned Disk Utility. I would use it to Repair Permissions. Then launch AMS. Does the + button work now?
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I'm going crazy and have spent two+ hours today trying to resolve what should be a simple issue, especially since I had it working at one time...
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I scoured this forum as well as the usual places across the net and haven't seen any mention of this issue, thought I'd post it here and see if anyone else has had this issue. I'm having a problem with a fresh install of 10.6.2 that I detailed in a bug report to Apple. Here's what I sent them:
"I have a firewire audio interface I use successfully with Logic Pro/Quicktime Pro 7/Finder in a multichannel (5.1) configuration for scoring and post, which works fine in 10.5.8. I can play multichannel (interleaved) 5.1 files bounced out of Logic Pro in Quicktime Pro and from within the Finder using QuickLook, and all channels play out of the speakers (which is of course configured properly in both Audio Midi Setup and Logic Pro).
In the latest version of Snow Leopard however, even though multichannel audio works fine in Logic Pro (probably because it has its own multichannel speaker config in Logic's audio preferences), this same hardware setup does not work outside of Logic. Multichannel audio files only play out of the left & right channels (C/LFE/Ls/Rs are summed). I believe the problem is Audio Midi Setup. Even though I enable the correct stream and choose the correct speakers from with "speaker configuration," and even though the test tone buttons work over the appropriate speakers in that window, after I hit "apply," when playing multichannel audio files in QT7 or via Quicklook in the Finder, the problem persists (summing all channels to L & R speakers).
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Has anyone else with a multi-speaker setup had any problems with AMS initializing their speaker configuration, and just plain not working?

Brent Daniels [Free] wrote:
... I believe the problem is Audio Midi Setup. Even though I enable the correct stream and choose the correct speakers from with "speaker configuration," and even though the test tone buttons work over the appropriate speakers in that window, after I hit "apply," when playing multichannel audio files in QT7 or via Quicklook in the Finder, the problem persists (summing all channels to L & R speakers).
Furthermore, when I click "Done" in the speaker config window and quit Audio Midi Setup and re-open it, the speaker configuration window reveals that my multichannel setup has reverted to Audio Midi Setup's intial state: a 2 channel (stereo) setup. I've done this at least ten times, as well as having deleted the AMS prefs and launched the utility in 32-bit mode with no success."
Has anyone else with a multi-speaker setup had any problems with AMS initializing their speaker configuration, and just plain not working?
I don't know if this will help you, but I once had a problem with Audio Midi Setup forgetting its settings - I found that the settings were only securely stored if I made the changes while logged on as an administrator.

Built in microphone not an option for Audio MIDI Setup

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Hi krk102588 - welcome to the forum!
I've just come across your post, and cannot believe that no-one replied to your issue before now!
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Audio MIDI Setup Issue -- "Thru" checkbox greyed out

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