It's funny you ask. I am able to do it on the first computer that I installed Wavepad on by choosing "What U Hear" as the input. However on the second computer that I installed Wavepad on, this option doesn't even show up. If anybody has an explanation, i would love to know! Anyway I hope that at least your computer has this option. Its after you press "record" under "Recording: Input...". Good Luck!