Problem with xfce-mixer in freebsd

[Antonio Del Rosso]

Hi all, i've a problem with xfce4-mixer-4.0.0_1 on my FreeBSD box.
I have 2 sound cards. dmesg says:

pcm0: <SiS 7012> port 0xdc00-0xdc3f,0xd800-0xd8ff irq 11 at device 2.7 on pci0
pcm0: <Avance Logic ALC200 AC97 Codec>
pcm1: <AudioPCI ES1373-8> port 0xe000-0xe03f irq 9 at device 13.0 on pci0
pcm1: <Cirrus Logic CS4297A AC97 Codec>


Well, but the xfce-mixer applet runs, but doesn't modify the volume.
Somebody can help me?

Thanks in advance
Antonio