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Does anyone have USB sound working for headphones?

Hi folks,
I have sound working on my laptop - both the speakers and the RCA jack output to powered speakers. Great. But my USB headphones don't work. USB is enabled in the bios and there are a lot of USB and audio modules installed. But perhaps there's one missing or the connection to the headphones is not activated or doesn't override the speakers/RCA jack. I'm not sure. 

Hotplugging a USB  mouse will work, but not the headphones.

I believe the headphones are detected because in the Volume Control
Device selector "HP Premium Digital Headset" shows up. But selecting it changes nothing. 

Here's a couple of lists of installed modules. Anything missing?
Any other pointers? Is there a package I should install?

	b.

# lsmod |grep audio

snd_usb_audio          64070  1
snd_usb_lib            13960  1 snd_usb_audio
snd_hwdep               5380  2 snd_usb_audio,snd_hda_codec
snd_pcm 60503 8 snd_atiixp_modem,snd_via82xx_modem,snd_intel8x0m,snd_ac97_codec,snd_usb_audio,snd_hda_intel,snd_hda_codec,snd_pcm_oss snd 46526 19 snd_atiixp_modem,snd_via82xx_modem,snd_intel8x0m,snd_ac97_codec,snd_hda_codec_intelhdmi,snd_usb_audio,snd_hda_intel,snd_hda_codec,snd_pcm_oss,snd_mixer_oss,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device usbcore 122498 7 snd_usb_audio,snd_usb_lib,uvcvideo,btusb,usbhid,ehci_hcd 


# lsmod |grep usb

snd_usb_audio          64070  1
snd_usb_lib            13960  1 snd_usb_audio
snd_hwdep               5380  2 snd_usb_audio,snd_hda_codec
snd_pcm 60503 8 snd_atiixp_modem,snd_via82xx_modem,snd_intel8x0m,snd_ac97_codec,snd_usb_audio,snd_hda_intel,snd_hda_codec,snd_pcm_oss 
snd_rawmidi            15515  2 snd_usb_lib,snd_seq_midi
snd 46526 19 snd_atiixp_modem,snd_via82xx_modem,snd_intel8x0m,snd_ac97_codec,snd_hda_codec_intelhdmi,snd_usb_audio,snd_hda_intel,snd_hda_codec,snd_pcm_oss,snd_mixer_oss,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device 
btusb                   9913  2
bluetooth              41827  9 sco,bnep,rfcomm,l2cap,btusb
usbhid                 33292  0
hid                    63257  1 usbhid
usbcore 122498 7 snd_usb_audio,snd_usb_lib,uvcvideo,btusb,usbhid,ehci_hcd 
nls_base                6377  3 isofs,udf,usbcore
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