I'm using Pluraleyes 3.5.5 to sync CAMERA AUDIO with EXTERNAL RECORDER AUDIO. Pluraleyes does its thing and I export for FCPX. I use the "REPLACED AUDIO" option. I open the xml in FCPX and I get CONNECTED CLIPS with VIDEO and EXTERNAL AUDIO synced together. Except the audio files show no waveform and are silent.
The weird thing is if I right-click the audio and click "reveal in browser" it creates an audio file in the browser, this audio file works perfectly, and I can even drop it into the CONNECTED CLIP and the video now has audio. So for some reason, FCPX knows which audio file to use and where to put it, but they are silent unless I manually re-add the audio.