HI scariMike, don't know if this will help. Had the same thing happen. When I double checked my timeline, the end triangle(orange triangle marker) was set before the end of my audio.
When I slid thee triangle to the end of the audio/music...it exported fully. Hope this helps.
Good Luck. I like crazy talk, but getting help in a timely manner can be very difficult at times, if you get any at all.
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