HP Pulse Subwoofer works in Control Panel but not in WMP/iTunes, etc.

Question

I have a Touchsmart Envy 23 and bought an HP Pulse Subwoofer for it. It worked fine for a couple of months, then one day it just stopped putting out sound when I play music from iTunes or Windows Media Player.
However, when I go into Sound in Control Panel and select Speakers/Headphones on the Playback tab, then click on Configure, the subwoofer works fine when I click on it in the Speaker Setup screen. 
It doesn't sound like a driver problem because I don't believe I would hear anything on the Speaker Setup if that were the case. Nor is it an app problem because it occurs with both iTunes and WMP, and in any event I don'tsee any options in either app for choosing between stereo and 5.1 sound (I do not have surround speakers, just the built-in stereo speakers and the subwoofer). Does anyone have any ideas how to get the sub working again?
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Answer 1

Ok, here's a few things that you may try
1) Uninstall drivers from device manager and restart computer, the drivers will be reinstalled automatically on reboot.
2) if does not resolve, then Find the Recovery Manager, Reinstall the Audion Drivers from that application & restart.
3) If this does not resolve, then i believe that there is a new driver available for the audio card, visit http://support.hp.com  to get it
4) As a last resort, because the other user acocunts are also not helping, i would recommend a backup and resinstall.
I can provide detailed instructions if you need thhem and do give me your PC's Product Number the next time you send a reply. I can then provide information specific to your product.
I am an HP Employee. I am speaking for myself and not for HP.
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