audino wrote:I see the Art USB Phono Plus v2 is defined as a pre-amp but not as an audio device.
No, it is a combined phono pre-amp and USB sound device (USB soundcard - with ADC/DAC onboard). And note that it it is a two-way sound device so you can route you sound output through it too (it has line level outputs marked "PREAMP LINE OUT").
audino wrote:I would prefer to record music through the line-in of the computer but NOT via the usb one.
My audio system has a background noise I can hear when I use the headphones and strangely only during gaming.
If that is the case then all you need to buy is something like the ART DJ-Pre11 (the one I have). But see below.
audino wrote:My audio system has a background noise I can hear when I use the headphones and strangely only during gaming.
Folk tend to listen more closely when they have headphones on - so it's sometimes easier to hear the defects. This suggests that you on-board soundcard is posssibly picking up mains hum or RF interference (the interior of PCs, especially laptops, can be very electrically "noisy") - or is of poor quality. That is why I, personally, prefer to use an external USB soundcard.
WC