[TMSZ] has a better option, a ~1 dollar USB sound card which is easily hacked to work as a simple oscilloscope. Easily found on eBay, the 7.1 virtual channel sound card is identical in brains to a ...

【USB Sound Card】- External stereo sound card connects to 3.5mm audio headphones, earphones, speakers or microphone via a USB port. For better playback sound quality, and providing a powerful ...

It may not be the first part of your setup that you think of upgrading, but getting one of the best USB sound cards for gaming can actually make a world of difference when it comes to audio quality.