ASUS Xonar Essence STX, headphone amp with SNR up to 124dB

I would guess all the analog out are inside the EMI shild, so from top to down be:
1. L
2. R
3. HP AMP out
4. MIC In
5. SPDIF out
I'm curious about those gold pins at the end of the card, test pin or new stuff for future upgrade???
 
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