need help : usb sound !

Hi, I,ve got a problem whit my usb sound cart -  problem is - there is no sound , I've got kubuntu and the card is speed link (bought on e-bay) the    lsmod | grep snd   give me this:nd_usb_audio 80416 2snd_usb_lib 18816 1 snd_usb_audiosnd_rawmidi 27264 1 snd_usb_libsnd_seq_device 9868 1 snd_rawmidisnd_hwdep 10756 1 snd_usb_audiosnd_intel8x0 34844 4snd_ac97_codec 97696 1 snd_intel8x0snd_ac97_bus 3456 1 snd_ac97_codecsnd_pcm_oss 47360 1snd_mixer_oss 19584 3 snd_pcm_osssnd_pcm 84612 4 snd_usb_audio,snd_intel8x0,snd_ac97_codec,snd_pcm_osssnd_timer 25348 1 snd_pcmsnd 58372 16 snd_usb_audio,snd_rawmidi,snd_seq_device,snd_hwdep,snd_intel8x0,snd_ac97_codec,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timersoundcore 11232 4 sndsnd_page_alloc 11400 2 snd_intel8x0,snd_pcmusbcore 134912 6 snd_usb_audio,snd_usb_lib,usbhid,ehci_hcd,uhci_hcdand in Kinfocenter in usb Ican see:C-Media USB Headphone Set Manufacturer: Linux 2.6.17-11-generic ehci_hcdSerial #: 0000:00:1d.7....Please help me ! ! !