VIRB Edit 4.2.1 audio distorted in exported files

VIRB Edit 4.2.1 (and I believe the previous version as well) creates exported files with distorted audio.

Here's a link to an example of how it sounds. (The example is on Youtube but locally export files have the same issue.)
https://youtu.be/XKlujSJAVZY
The exported files are unusable. The originals have perfectly clear audio (recorded with a VIRB XE).

Is there a workaround for this??