How to listen from radio device?

I have a radio card with /dev/radio correctly created. I've connected my radio card to soundcard, on line-in port, I run mplayer and I listen...silence. mplayer -radio adevice=hw=0.0:arate=96000 -rawaudio rate=96000 radio://103.8 Modules are loaded lsmod |grep -i alsa saa7134_alsa 11554 0 saa7134 163772 1 saa7134_alsa