I am having trouble recording a cassette player onto XP. (1) I play a cassette recorder into my PC's line-in and I can hear it clearly in the speakers. (2) I select line-in on XP's recording control (SNDVOL32.EXE). (3) However when I press the record button on Audacity, there is no audio signal displayed on the graph. I also tried XP's Sound recorder (SNDREC32.EXE) and Windows Media Player. Can you advise?