Back to back scratch noises from speaker and headphone jack, very faint

I'm having a headphone/speaker issue, but it is very difficult to describe. When I use my computer, the speakers or headphones (if plugged in) will occasionally emit two quick scratchy noises back to back. The speakers and headphones work great, but I can't figure out what the noises are. They sound kinda like if you were to gently scratch the macbook pro casing with your fingernail. Any ideas as to what can cause it to happen?

it seems that m1r3k found a very good workaround, at least for the Mid 2010 Mac mini models (that I'm using right now). I don't know if it works also with more recent Mac mini models.
Re: After upgrading to lion, cant select HDMI sound setting
Open Audio MIDI Setup.app in /Applications/Utility, click the + (plus) button in the bottom left corner of the window and choose "Create Multi-Output Device". In the new device settings tick the HDMI "Use" checkbox and you're done. Simply go to the usual System Preferences Audio panel and choose the newly created device, without the need to unplug the audio cable from the back of the Mac mini. You can also name the new audio device as you want.
NOTE:
This is only a workaround for a deliberate choice made by Apple on OS X Lion 10.7.2 and beyond:
Mac mini: About HDMI audio and headphones
Please let Apple know (here or here) how this has made things unnecessary awkward for users and needs to be fixed (these forums don't count, they are not read by Apple's employees)!

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There is probably a red light on inside your headphone port, indicating that the analog/digital switch in there is stuck in the digital position. Insert a headphone plug and wigle it around, especially in the horizontal plane, as you insert and remove it several times. This will usually unstick the switch and restore normal operation. If it doesn't, the machine will need to be repaired.
This has been a fairly common problem, but in most cases it is easily cured as described above.

I need to have audio out from HDMI and headphone jack simultaneously

I need to have audio out from HDMI and headphone jack simultaneously.
I seem to be able to select one or the other, but not both ? !
Thanks

No. You can only use one sound output:
Why can't I select HDMI audio on my Mac mini?
If you connect an HDMI display or television to a Mac mini (Mid 2010 or later), you might not be able to select the HDMI audio device (in System Preferences > Sound > Output). This can happen if you also have headphones plugged in to the computer. Unplug the headphones to be able to select HDMI audio.
Mac computers: Frequently asked questions about using HDMI

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I personally haven't experienced much of the "reverberation/feedback" when using a headset on the i4S...
Yes, I have near-perfect hearing too (for scope, squeaky brakes hurt my ears) I come from many conversations on many phones and types and first off, CDMA technology is great for coverage, terrible for voice quality. HD Voice in Europe made for some of the best phone conversations I've ever had.
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I just installed my new iMac, which replaced my Mac Mini. I hook my Mac to my stereo via the headphone jack for playing iTunes. But most of the time I don't have the stereo on.
is there a way to keep the headphone jack plugged in and still have audio come out the internal speaker? Basically send audio output to both the internal speaker and the headphone jack at the same time?
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There is probably a red light on inside your headphone port, indicating that the analog/digital switch in there is stuck in the digital position. Insert a headphone plug and wigle it around, especially in the horizontal plane, as you insert and remove it several times. This will usually unstick the switch and restore normal operation. If it doesn't, the machine will need to be repaired.
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Hi ,
Thank you for visiting the HP Forums! A great place where you can find solutions for your issues with help from the community!
I came across your post about the Notebook, and wanted to assist you! I have looked into your issue about your HP Pavilion g series Notebook and issues with the sound. Here is a link to help troubleshoot issues with the sound. Please note remove any and all USB devices. Disconnect all non-essential devices and headphones, as these could cause some issues. Here is an automated tool for troubleshooting Windows 7. It has a built in Audio repair built into it. I hope this helps with the sound. Thanks.

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Hi,
My name is Anbu, I am using Portege R700 Series. I am facing a strange problem
When i am using head phone for listening (I am plugging only speaker pin - Green colour), it works properly i.e i am hearing sound from head phone only.
If I *plug both Mic & speaker pin* of the headphone (Both Red & green colour pin) into the respective slots, both *laptop speaker and headphone speaker makes sound.* Ideally only +head phone should work, not laptop speaker+
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Please check the settings in the +control panel -> sound -> recording tab+
Click right and mark the options: enable hidden devices and enable disabled devices
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<img src='http://img97.imageshack.us/img97/9074/captureyeb.png' width='550px'>

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Hello Dev2810,
Welcome to the HP Forums!
I understand the notebook produces sound from both headphones and speakers. I will do my best to assist you! The only troubleshooting I could suggest in this thread: Headphones plugged in, but speakers are still playing sound
I provided these steps a while ago I noticed it resolved all instances of this issue, when done properly. Please try the steps and let me know what happens. Thanks!
Mario
I worked on behalf of HP.

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A reset should fix it:
Double click the Home button. Slide up with one finger on ALL your apps to close them.
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Is there a pattern to the time of day or other detail that may be
traced back to a OS X system cause of this odd phenomenon?
Are there any copies of system files on any of the attached USB
external drives? Any libraries, such as iTunes, iPhoto, etc?
Once the drives are indexed by Spotlight, are their permissions
ignored by the OS X? Content, if neutral, should not affect the
wake or sleep cycle; especially if they're ignored by the OS X.
Could there be a bad cable or other component? If so that would
be a difficult process of elimination to detect it. Usually replacing
most suspect components in the USB stream (external to Macs)
is a rote way to mechanically test that idea; & not 100% sure.
Does the equipment all have a good ground to the utility or house
electrical field? An intermittent ground may affect more than sleep.
Hard to say at this point. Maybe a late-night talk radio guru on
remote viewing could peer into your situation and sleuth it out?
Sorry to have run out of ideas, but the process must be electrical
& mechanical to some extent. - Or perhaps odd software inspired.
Do you have any phone-home spyware items inside, just jumping
at the chance to spill your information? Little Snitch may help.
PS: Perhaps the computer needs to go into Apple & have a genius
or product specialist at AASP test the unit thoroughly... BlueTooth?
see:
https://www.google.com/?gws_rd=ssl#q=Wake+reason:+XHC1
Good luck & happy computing!
edited 2x

Back to back scratch noises from speaker and headphone jack, very faint

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