IIRC, mp3s aren't fully supported in fcp. Use an aif instead if you have it, or convert the mp3 to an aif (which will lose a little quality, but it's tolerable for most projects) with audacity or somesuch.
IIRC, mp3s aren't fully supported in fcp. Use an aif instead if you have it, or convert the mp3 to an aif (which will lose a little quality, but it's tolerable for most projects) with audacity or somesuch.