Problems with the output connected to an amplifier
Even though i ordered the "optical out" version of this device, i received the "virtual 7.1" device (which as well has an optical output, though i haven't tried it). (i assume that when only the stereo output jack is used, the output is not affected by the virtual 7.1 processing, though if anyone knows otherwise please comment.) when i plugged it in windows found the driver and installed it with no problem. I have the output connected to a stereo amplifier and room speakers. Everything seemed fine until i put my computer into standby, or turned it off completely, at which point there was a very loud 60-hz hum, which did not go away until i turned the computer back on and then sent a signal to the card, which resulted in the hum abruptly disappearing. I informed the vendor of this and he refunded my purchase price. This problem did not occur with an internal sound card or a similar (trond) usb card. Nor did it occur when i connected headphones rather than an amplifier to the output.With nothing to lose, i used a split wheel to open the case up, verified that it uses a via vt1620a chip, and found if i shorted together the commons of the usb connector and the audio connector, that the hum problem went away. With this modification it works fine, with the exception of a somewhat annoying pop when the computer is turned on or off.I give the device a 3-star rating because if you intend to use it only with (ungrounded) headphones, it should work fine. But if you want to use it with an amplifier be warned - it may not work without ruthless modification.