To use Music 1's built-in auditioning player, you must have the drive/path/filename entered into the FILE field on the Music 1 cards. If you have the audio files tagged, then Music 1 can automatically import and update the data in the File field. This will work with .mp3, .ogg, .wma and other "tagged" audio files. .wav files do not have tags, so this mass-update can't be done with files of that type. Contact the Music 1 support office if you want to get the proper data string into Music 1 for .wav files.