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Audigy 2 has a dedicated digital out jack, so I am not sure why it would need a DOO switch, so I imagine that if you cannot see it in kxmixer, it is because it does not have/need it.
DOO is needed for cards that do not have a dedicated digital output jack (i.e. with cards with a digital out jack that outputs both analog and digital, the switch is needed to swap between analog/digital (because you cannot use both at the same time with such cards)).
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