This has happened with many editions of Roxio, but only with some files. I have three cameras that capture video, but I do not associate the problem with any specific camera, though I may be mistaken.
Latest instance: a clip shot with a standard def JVC camcorder; an MOD file. When I play this MOD file with Windows Media Player, the sound is 100% good.
I open Videowave -- Videowave15.exe in this case -- and with media selector bring in that MOD file, and play the clip. The video is 100% good, but the audio is not. I have "experimented" with using Any Video Converter to process the clip just to convert the MOD file to other formats, such as m2ts and mpeg2. These converted files play OK with WMPlayer, but not when I bring them into VideoWave, then hit the play arrow. However, and this is astonishing to me, if I hit the TRIM button and then the play arrow, the audio is 100% good. This difference between playing the clip in the storyline and playing it in the Video Trimmer may provide a clue to those who understand audio codecs.
I know nothing about Codecs except that they exist, and in my ignorance wonder if my issue has anything to do with such functionality.