Yes, I looked at other board entries. And yes, I was underwhelmed by the response (I summarize by throwing up my hands).
I have screeching audio on several DVD ISOs. The problem appears related to newer GENERAL themes but I have not tested all.
The images and mp3s are stored on the same physical NAS. No problems with the images.
So there's a growing number of people reporting the problem and there's nothing by way of suggested action. Lets fix that.