There are two rather different AudioPCI cards. After this BIOS will take care of initializing the PCI devices.
AudioPCI card contains actually two independent audio devices.
It's possible to use both of these devices simultaneously. Certain Gateway models have a digital output capability which can support digital speakers. Then save the file and run soundon. There are some mixer features which can be controlled only by using the ossmix program included in the OSS package. Most ES1370 based cards have capability to switch the line in connector to work as another stereo output.