I am trying to export a 5.1 mix for Blu-Ray in Compressor, and keep getting an echo. I was given 6 .wav tracks by my audio mixer, imported them into FCP7, lined them up (everything sounded great), then exported the audio channel grouped to get 6 .aiff files. Then, as Compressor suggested, I re-named the audio files according to their assignment (-L,-R,-C,-LFE,-Ls,-Rs) and dragged them to their appropriate location in the surround sound field. All the settings match the settings of the audio (24-bit, 48Khz), all the tracks are the exact same length, but when I preview in Compressor or export, I get an echo - some of the tracks are off. I imported the .aiff's I had exported from FCP back into FCP to see if the problem was with the export, and they line up fine in FCP. I have been searching online to see if anyone else has this problem, and I can't find anything. What am I doing wrong?