Guys, this could've been something simple, like the default device, for example?..
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Just check the settings, from the Windows Control Panel, as Vista & 7 tend to mix things up. Again, for example, my ASUS AH3650 has HDMI and after installing its default software & the motherboard integrated soundcard default software, those jacks tend to mix up; just stupid programming, on behalf of Micro$oft.
P.S.
Here's the screenshot from the example above, why I don't get playback before I switch the defaults on my machine:
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