Hi Wayne,
my copy of mpeg streamclip opened this no problem – QT would not.
Onto the distortion – There is a miracle technology! It’s a bold claim I know but hearing is believing in my case.
Cedar Audio – https://www.cedar-audio.com/
Great people – great technology – In the past I have sent them a short clip, like yours, which they worked on, sent back and asked if I would like to process the whole clip – send them back the files you need fixing and they turn them around quite quickly. Not too expensive either.
You can buy the technology but I believe it’s VERY expensive. Great if you are handed problem rushes all the time I guess.
Give them a try – you won’t believe your ears!
BTW their noise reduction stuff is A1 too – I’ve used their real time noise reduction units on many TV productions – the latency was a small problem but overall amazing!
Best of luck,
Ant.