Macbook Pro speakers fade in and out, speaker to speaker

I have an early 2011 15" Macbook Pro, using Mac OX Mountain Lion 10.8.3
The last few weeks I have noticed my speakers fading in and out. It does it in various players an browsers (youtube, blip.tv, quicktime, etc.,.) I tried this solution, but I cannot find that plist file anywhere on my computer, even after showing hidden files! I tried doing a PRAM reset, no dice.
Is that plist file suppose to be missing? How can I that plist file on my computer? If I have to go to the genius bar, will they have to charge me, or make me replace the laptop for a 'new' one because I do not have AppleCare?
I have only had this mac for a couple of months, and I haven't gotten any liquids on it, nor have I dropped it! Please help!

Hi Kate...
This has been happening on different players
Might be corrupted preferences ...
Go to /Library/Preferences
Move the com.apple.soundpref.plist file from the Preferences folder to the Trash.
Restart your Mac.
The Mac OS X will regenerate a new .plist file for you.

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MacBook Pro speakers fading in and out

Hi everyone,
I have had my MacBook Pro for less than a year and usually very happy with it. However, in the last week the speakers have been playing up. When I'm watching a show or movie, at unexplained times, the audio will fade out so it sounds really quiet and sort of far away. This has been happening on different players, such as VLC and Quicktime. It also happens with different files, and at random times.
I was wondering if anyone else has had this problem? Oddly enough, it seems that playing a song or two on iTunes fixes it (!?). Does anyone have any other solutions? It's incredibly annoying!
Cheers,
Kate
Oh, and the laptop has definitely NOT been around any liquid or anything that could have damaged the speakers, I am very cautious!

Hi Kate...
This has been happening on different players
Might be corrupted preferences ...
Go to /Library/Preferences
Move the com.apple.soundpref.plist file from the Preferences folder to the Trash.
Restart your Mac.
The Mac OS X will regenerate a new .plist file for you.

Landline to MacBook Pro for dialing in and out

I'm not sure this is the place to post this, and if it's not I'd appreciate pointing to where it's most appropriate.
I have a phone on my desk at work. It is part of the office's systems and has caller ID and transferring capabilities. I speak on the phone a lot and type at the same time, which gets tiring.
I have this idea to somehow use a splitter at the phone socket on the wall with one end going to the existing handset and the other to my MacBook Pro. I would like to then use my MacBook Pro to dial and pick up calls and use my MacBook Pro's speakers to get the caller's voice and the MacBook Pro's microphone to pick up my voice.
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http://forums.macosxhints.com/showthread.php?t=49338
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http://www.shopbot.com.au/pp-apple-usb-modem-price-33476.html
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Thanks Roger.
I hear you re "less hassle". However, the reason I ask is because I also listen to music whilst I work via a bluetooth headset. My ultimate goal is to set all sound from the mac to come out through the bluetooth headset and the Mac's built-in mic to pick up my voice. To answer a call I'd just take the handset off the hook and work hands-free.
I can't change the handset from work, unfortunately, so I can't get a bluetooth phone or anything.
I'll probably get the modem anyway as it's useful to have. Thanks.

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I just got my new macbook pro a few weeks ago. The display dims in and out at times, why does this happen? What can I do to fix it? I really don't wanna replace it already or what not.

Welcome to the Forums!
Most likely the ambient light sensor - the system is set to automatically adjust brightness based on changing light conditions. You can test this out - put your hands over both speakers and your display should dim quite a bit. To turn this feature off, go to System Preferences > Displays > Display tab and UNcheck the box for Automatically adjust brightness.

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With the HDMI connected and the Onkyo powered on, open system preferences, go to the sound panel, and select the HDMI choice.
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Go step by step and test.
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Macbook Pro speakers fade in and out, speaker to speaker

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