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The wiki Ensoniq AudioPCI article says that step 3 of the initialization process is to write 0xFF to the codec register (for the 1371). However, it says nothing about the 1370. How does the codec register work for the 1370 and do I need to mess with it at all or can I just skip that step?

I found the ES1370 and ES1371 datasheets. It looks like the ES1370 uses a completely different codec, mapped at offset 0x10 instead of 0x14, and doesn't have a sample rate converter.

I don't know what that means for initialization code, though. Maybe the Linux driver will be helpful.

I think that datasheet was the same one I found. From my POV (might be wrong) the ES1370 has a completely different register map, but that might be me. I'll look at the Linux driver again -- I got a bit confused last time, but I'll look again.

Maybe you were looking at the codec registers? Those are completely different, since it has a different codec, but the rest of the registers (except the sample rate converter) look the same to me.