have you tried google
? Take a look at the official ALSA
ALSA and OSS are both included in the later 2.6 kernels, along with many soundcard drivers. They may be compiled into the kernel or compiled as modules. You need ALSA in order to have sound working and I don't think it is possible to access soundcard drivers in the kernel without first turning on support for ALSA.
It seems strange to me that you do not entirely know about ALSA and OSS, but for some reason you want to remove them...