Hey I'm an audiophile nut, but I would question the need for a separate sound card. Especially on a Hero board, see below quote from their site.
If you want better sound 1st, you better have some pretty good speakers or you won't hear a difference. But next goto an External sound device. Use the TOS-Link optical output and connect to a D/A converter input of your surround sound receiver. This then goes to your amplifier/receiver and its speakers. (yeah, my PC is connected to my Home Theater System....)
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