S/PDIF support

[Yuriy Tsibizov]

> > I can speak for emu10k-based cards only, and I like my 
> > Audigy Platinum EX.
> 
> EX?
> Are thy still manufactured?
No. It's an old Audigy (not Audigy 2 or newer Audigy with two-letter abbreviature) card with external AudigyDrive.
> I'm seeing Audigy 2 ZS and Audigy LS Cards only.
> Do the newer ones use the same chip?
No. Audigy LS is known to be unsupported by both FreeBSD and my driver. 
I don't know anything about Audigy 2 ZS. Some (old) Audigy 2 cards are supported.

Yuriy