Hi zvit
I meant is his computer a laptop?, I don't see why he has two sound cards.
I don't see any reason to not just have one good internal sound card if it is a desktop, why switch back and forth.
I didn't even know that there was such a thing as an external USB sound card...
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But apparently there is.
Anyway you might be able to switch back and forth by right clicking on the desktop and selecting personalize, then sounds, I don't know if it will show options for more then one sound card or not, because I've never seen a setup like that, but it's where I switch my output from my computer speakers to Hdmi output for my HD TV.
Mike