I've been using FCP X for a couple of weeks, and as far as I know this is the first appearance of this problem, as least as I've noticed.
Certain imported audio files are suddenly sounding incredibly lousy. They are mp3's but ripped from CD's with high quality settings, and the tracks sound very good in my iTunes. In FCPX however they sound like the lowest compression quality imaginable - extremely tinny with warped high end and very little low end, mid range also very squashed. It seems to have started happening with various imported tracks, but at random; some sound fine, and the good and bad tracks are scattered in terms of when they were imported, some were done earliest, then some are fine, then others later are also terrible.
None of the audio attached to imported video has been affected. The most peculiar anomaly is that with one particular track, it sounds bad when played in the browser and bad when newly placed into the timeline. However, section that was placed in the timeline about a week ago, sounds totally fine! This seems to clearly indicate something weird is going on with my audio once it is inside the progam, not on the way in.
I don't know if this could possibly effect anything, but the problem may possibly have started after working on trying to edit music clips in connected storylines, and at the time I first noticed it, I was having a horrendous time trying to match clips togehter without pesky invisible gaps, using zoom and precision tool to pull the ends appart and delete gaps. Perhaps not coincidentally, I believe this was the first time I was joining detached audio from a video clip (the audio was high quality AAC as encoded by iSkysoft Media Converter from DVD sources,) joining the audio in connected storyline with music from mp3 sources. Once again, the audio from the video clips, attached or detached, has never had a problem, only the mp3's. Anyway, after finally getting the edits to behave as I wanted, I started noticing the music track in question sounding like dookie.
I am using optimized media, once again from high quality mp3 sources.
I have updated from 10.0.3 to .4, and restarted the computer, nothing is helping. And once again, an early ingested music clip that sounds terrible in the browser and when newly placed in the timeline still sounds fine where it was originally placed in the timeline early in the project. Crazy.
Any help is appreciated. This is the first sign of a series performance failure I have experienced with the program, and it is very disconcerting!