Dear: I am using a tv card which has a standard usb audio interface, when I plug the card, snd-usb-audio finds my usb audio interface, And I use mplayer to test the effect, unluckly, I could not get and sound. And I give mplayer these parameters: """ mplayer alsa:adevice=hw.1 ,0:volume=100:immediatemode=0:amode=1:audiorate=48000:forc eaudio """ I am getting so frustrated by this problem. I don't know how to let USB Audio driver to drive my audio interface. Please help me.