Final Cut Pro X exported QuickTime file has distorted audio

Anyone experiencing distorted audio with a QuickTime movie file exported from Final Cut Pro X? The audio sounds great in the timeline, but muffled and distorted after exporting it. Here's the kicker, I took that same file and opened it using QuickTime 7 and the audio is fine. I took that same file and converted it to a WMV file using Flip Player, and the audio is fine. So it would seem that the problem is the newest version of QuickTime (v10.4). If any of you have come to a similar conclusion, is there a way to remedy this? It's problematic because when I upload the file to YouTube, the distortion is present. Thanks in advance to everyone who can assist with this.

MY SYSTEM:

MacBook Pro (Retina, 13-inch, Late 2013), 2.8GHz Intel Core i7, 16GB RAM

OSX Yosemite 10.10.2

FCPX v10.1.4

QuickTime v10.4