[CentOS] How and when are the sound modules loaded at system boot time on CentOS 5?

Keith Roberts wrote:
> 
> Doesn't the kernel probe the machine's hardware at boot up 
> time, and if it finds your soundcard, load the appropriate 
> driver for it?

I assume something does probe some how - which is what I trying to work 
out. i.e. what exactly does the probe and where in the startup sequence 
is this done?

Thanks

James Pearson