Please open Options (* see below to open Options), Audio Tab. Please select an applicable sound player from "Device" dropdown box.
To open Options either: (1) Go to Home Tab, press Options, or (2) Press CTRL + SHIFT + O, or (3) Menu -> Tools -> Options
If problem still exist:
Please check connection to your speakers.
There may be a problem with the sound card, you may need to update your sound card driver. Instructions to update the soundcard driver is in Help page (F1), and click "[N](file:///C:/SourceCode/wavepad/lxa/win/help/noaudioinput.html)o Audio Input"