Ok I have to put my 5 cents in here ...
A little OT but when 2 year old James Bulger was murdered in the U.K. by two 10 year old boys, Venables and Thompson in 1993, the CCTV in the case was virtually not viewable and certainly you could not make out any pertinent conversation. However, it was eventually sent to NASA, yes NASA space agency in the USA and they were able to clean up both the visual and audio to enable them to be published and the boys responsible to be identified .
That was February 13th 1993.
We are now in November 2018, some 25 years later. And technological advancement since then has seen a meteoric rise in what can be achieved.
So let’s put this into perspective in relation to the inaudible content of the 911 call - and can we be expected to believe that it can’t be ‘cleaned up’ with a view to the audio being advanced and the Sheriff being able to determine exactly what was said on the 911??? Because in the absence of other evidence, I think the 911 call is of most importance. All MOO