Click the Sequences tab - above the bin - then right-click on the sequence and Save Sequence Audio as New File.
That will be a WAV file, stored in the PC Music folder.
If there is no Sequences tab, add a new blank sequence by clicking the + sign on the sequence tab that's just above the timeline.
Import it to WavePad, then experiment will the many different effects the program has to offer. Once done, SAVE, then add the file to VidePad, and mute the original track.