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Have you selected any audio input via the small down wards facing triangle on the right side of the "Screen Recording" window?
 
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Speakers can be used as a microphone, as they have some similarities with microphones, but for your purposes you either need an external microphone connected via the Line-In or use the internal microphone.
That is if you want to record YOUR voice.

Or do you want to record the sound that normally comes out of your speakers?

If that is so, QT X will not do that. You can use Audio Hijack for this.
 
That is what I have selected now, I just wanted to record from the internal speakers. Quicktime will record Youtube this way, but the other screen recording apps are not working.
I don't have Quicktime X so I can't check but it's possible that that is an ability of the screen recording feature, to grab the system audio along with it. (Not to mention that it's 5 ways of stupid to record the screen to save Youtube videos when you can just download them.)

If you want to duplicate the effect with other screengrabber applications you'll probably need Soundflower.
 
The system audio is what i've somehow lost the ability to record. This mat be my fault but what am I missing here. ishouhdpro has sound flower built in, but when I have it turned on in the app it cuts of the sound.
That's one misfortunately named app unless properly capitalized...

I also had the same problem when starting recording with iShowU (note caps, otherwise very hard to read correctly), just hit the volume key once and you should get audio through your speakers, at least that solved it for me.
 
If you will look closely at the to of the app where it says applications, I should be able to leave that on so I can record from apps like vlc and Safari. Above that is a Youtube vid that I cannot hear with the app open. If I turn off application button or quit the app the sound return. I am up in the air on this one. Something is wrong in the os.
Looks like I have a different version of iShowU, so you're on your own from here.

Still sounds like PEBKAC though.
 
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