Weird... some add-on board that has optical and coax digital output/input. Looks like the added ports are mini-xlr in/out.

If it were me, I would get it. That's a pretty sweet mod.

According to my Live! manual there was an add-on board that added those connectors and attached to the case with its own slot cover. Here it looks like someone build their own bracket to attach the add-on internally instead.

Likely a DAC upgrade and likely balanced XLR I/O using some micro-sized connector. Hoontech marketed breakout boards for the SB-Live! expansion connector.

http://www.hoontech.de/produkte/sbdb3.html

Those are AES/EBU connectors. They are logically similar to SPDIF but are electrically balanced.

Yeah it looks like the add-on card is supposed to normally take up another card slot to provide the digital I/O (AES/EBU, optical and coax S/PDIF) that is normally found on the Audigy drive bay thingy, but they modified it so that the AES/EBU I/O is routed up to mini XLR connectors attached to the card's I/O bracket, so the whole thing only takes up one card slot. My hat's off to the modder.

I really question why they did it, though. It's not like using an SB Live card with Cubase is ever going to be very good compared to a Hammerfall, for instance.

Hmm, I might just grab it then, if anything just for the modding job. Maybe they modded it like that to save an IO slot? Who knows. I don't have the proper connectors for it but those shouldn't be too hard to find.