Hard to tell since you do not give us *any* useful information about your soundcard...
sorry :P
Do an "lspci" as root and look for the chipset of your soundcard. When you have the output of lspci, your SC manufacturer and model, write again.
this is what I got from lspci:
00:02.7 Multimedia audio controller: Silicon Integrated Systems [SiS]
SiS7012 PCI Audio Accelerator (rev a0)
Subsystem: Giga-byte Technology: Unknown device a001
Flags: bus master, medium devsel, latency 32, IRQ 9
I/O ports at d800
I/O ports at dc00
Capabilities: [48] Power Management version 2
Last time i used RH, hence I know nothing about how to install soundcard.
Thanks!
Tuan ANh