>There exist some ac97 codecs capable of hw multiplexing?
>What are them?

I think that none. AC97 is only part of sound system. These part is 
reponsible for A/D and D/A conversion + analog mixer + spdif in + 
spdif out. Most capability is in second part. This second part is 
responsible for playing digital sound and hardware mixing and is 
integrated into motherboard chipset. For example you can have two 
motherboards which uses same AC97 codec and one (for example VIA8235 
based) is capable hw mixing of 4 streams and second (for example 
intel based) can't do hw mixing.

Peter Zubaj



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