I'm using registered version of SoundTap 1.4 on WinXP SP2 machine. Often when I try to make a recording, there is a crackling sound (kind of like loud scratchy static) that is heard over the computer speakers and picked up on the recording. It ruins the recording. It doesn't happen every time, and sometimes it kicks in after the recording is in progress. Any suggestions on eliminating this unwanted interference would be appreciated.