Sound card
2 main chips marked as follows:
ESSData sheet (PDF format)
AudioDrive
ES1688F D325
VB38565
ESSOn the circuit board is written
Audio Drive
ES968F B315
V61008
The Sticker on the other side says
A16-001360960
FCC ID database says
Manufactured by Audiowave Technologies
Is it Audiowave Green16?
See ESS's site and Multiwave's site for potential drivers.