Get a male-male 3,5mm jack cable first. That's all the hardware you need for the test.On one of the cards, connect the line out (output of the sound card) and line in (where you're plugging in the VCR). Start with a low playback volume in your OS. Then run the benchmark. You may have to boost the playback (or recording) volume to get more accurate readings.Repeat for the second card.