Knoppix 3.9 installed on hdd

Audio is configured but I can't modify volume (nor from mixer neither from apps like xmms)

I'm using OSS

Here it is lspci -v output


0000:00:02.7 Multimedia audio controller: Silicon Integrated Systems [SiS] Sound Controller (rev a0)
Subsystem: Unknown device 1849:7012
Flags: bus master, medium devsel, latency 32, IRQ 18
I/O ports at c400 [size=256]
I/O ports at c000 [size=128]
Capabilities: [48] Power Management version 2][/code]