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