Setting Stereo Mix to default recording device on Windows 8 HP Envy Ultrabook Kills Speakers

When I try setting Stero Mix to be my default recording device, the audio playback always cuts off after about 5-10 seconds or so. When it cuts off it doesn't sound good - it sounds like my speakers fry themselves to a quick and painful death if you can imagine that sound (ok, maybe i'm exagerrating).
Sometimes I have to reboot in order to hear any audio again on this ultrabook. Other times the audio will come back on its own after some time (it may always comes back over time, but most times i'm impatient so I reboot).
Is anyone else with my config able to set Stereo Mix to be the default recordgin and still retain a workable playback device? Anything else I can try?
I have the HP Envy Ultrabook laptop with Windows 8 Pro 64 bit.
Thanks,

I have since discovered stereo mix works when the laptop is plugged in. If it's unplugged it still will not work even though the setting "continue using while on battery power" is checked in the properties. If this is by-design I suppose I can live with this.

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The question is not about x64 machines, The answer was correct for the question. The question is closed. If you have a new question please start a new topic.
Please review the forum guidelines.
http://social.technet.microsoft.com/Forums/en-US/ITCG/thread/a0def745-4831-4de0-a040-63b63e7be7ae
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I'm french also excuse me for my english...school ^^
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http://images4.hiboox.com/images/3008/9849a2fadd2adf1f7cc2cba4c7e06e6c.jpg

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heroesp,
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Moderator comment: Subject edit. Model added.

Hi curiousgeorge,
Welcome to Lenovo Community Forums!
Try setting it up as the Stereo mix is the default Recording Device but do not disable the the MIC.
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I've been looking for ages on how to enable my Stereo Mix and I just can't get it up...
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*I found a solution!*
Stereo Mix is a sound device for recording music from you computer.
It is very useful for marketing purpose.
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;HKR,%EPattributePath%\EpSettings\PcBeepCtrlEnable ,Enable,1,01
;HKR,%EPattributePath%\EpSettings\PcBeepCtrlEnable ,EPname,1,01
;HKR,%EPattributePath%\EpSettings\PcBeepCtrlEnable ,DefGainSettings,1,00,07,00,07
;HKR,%EPattributePath%\EpSettings\PcBeepCtrlEnable ,MuteGainSettings,1,00,00
;HKR,%EPattributePath%\EpSettings\PcBeepCtrlEnable ,Flags,1,00
;HKR,%EPattributePath%\EpSettings\StereoMixEnable, Enable,1,01
;HKR,%EPattributePath%\EpSettings\StereoMixEnable, MixAssocSeq,1,E0,E0
;HKR,%EPattributePath%\EpSettings\StereoMixEnable, MuteGainSettings,1,00,00
Note the semi-colons in front of each line. Remove all the semi-colons so the 8 lines above read like this:
HKR,%EPattributePath%\EpSettings\PcBeepCtrlEnable, Enable,1,01
HKR,%EPattributePath%\EpSettings\PcBeepCtrlEnable, EPname,1,01
HKR,%EPattributePath%\EpSettings\PcBeepCtrlEnable, DefGainSettings,1,00,07,00,07
HKR,%EPattributePath%\EpSettings\PcBeepCtrlEnable, MuteGainSettings,1,00,00
HKR,%EPattributePath%\EpSettings\PcBeepCtrlEnable, Flags,1,00
HKR,%EPattributePath%\EpSettings\StereoMixEnable,E nable,1,01
HKR,%EPattributePath%\EpSettings\StereoMixEnable,M ixAssocSeq,1,E0,E0
HKR,%EPattributePath%\EpSettings\StereoMixEnable,M uteGainSettings,1,00,00
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