to properly capture and play back audio, make sure you've set appropriate recording and playback volume levels as follows:
1 double-click the speaker icon on the windows taskbar.

tip if you don't see the speaker icon on your windows taskbar:
- in windows xp, run sounds and audio devices from the windows control panel, select place volume icon in the taskbar, then click ok.
- in windows 2000, run sounds and multimedia from the windows control panel, select show volume control on the taskbar, then click ok.
2 choose options ] properties.
3 select the recording option, then select all check boxes in the list. click ok.
4 for each of the controls (line-in, microphone, etc.), make sure the volume sliders are at an appropriate level, such as at half-level. as well, clear all the mute check boxes.
some items in volume control may contain a select check box instead of a mute check box. enable select to turn on sound for those items.
5 choose options ] properties.
6 select the playback option, then select all check boxes in the list. click ok.
7 for each of the controls (line-in, wave, etc.), make sure the volume sliders are at an appropriate level, such as at half-level. as well, clear all the mute check boxes.
8 close the dialog box.