Hi, im working on a project with clip sound and mp3s (bought in itunes). When i play it within FCPX everything works good. When i export it the mp3 sound get choppy and the clip audio worse than original. The video is perfect. The project is in ProRes 442. Ive tried exporting in many formats. To apple devices, mpeg2, video/youtube compatible, even small size for streaming on phones. Ive also tried with compressor app , and playback on other machines. Same problem. Any ideas ?