It seems like many people are having the same problem. Whenever you try and play a real audio file on the newest version of JetAudio it turns the .wav volume on your computer to 0. If you go to turn it back up manually it will go back down at the start of the next real audio song. This doesn't occur with MP3 files, only real audio. I tried an older version of JetAudio (5.1.10) and there are no problems playing any types of files so it seems like there is a bug in version 6.0.3.