I recommend that everyone, especially newcomers to the acoustical evidence, read Jason Wakefield's March 2003 article "An In-Depth Study of the Acoustical Evidence in the JFK Assassination." Wakefield's article provides an excellent overview of the history of the acoustical evidence and where research on the dictabelt stood as of 2003.

In 2003, Linsker and his colleagues were still struggling to produce a response to Dr. Don Thomas's 2001 defense of the acoustical evidence in the forensic science journal Science & Justice. The Linsker group submitted a rebuttal to Thomas's article in March 2002 but quickly withdrew it. In reading the draft rebuttal, it is apparent why they withdrew it: it raised only minor points against Thomas's article. They spent three more years working on a response.

In this 2001 article, Dr. Thomas made a convincing case, based on the NRC/NAS panel's calculations for the timing of the transmissions on Channel 1 and Channel 2, that the Bellah "you want" transmission was a far more plausible timing indicator than the Decker "hold everything" transmission. In short, Dr. Thomas showed that if the NRC/NAS timing calculations were correct (and he assumed they were), the Bellah transmission was a far superior timing indicator than the Decker transmission, which refuted the NRC/NAS panel's main argument against the acoustical evidence.

It is crucial to understand that the primary scientific argument that the NRC/NAS panel made against the acoustical evidence was that the Decker "hold everything" transmission was crosstalk and that this proved the impulse patterns on the dictabelt were recorded about one minute after the shooting. Until the panel finally looked into Steve Barber's information about the Decker transmission, they had done nothing but manage to reduce the probability of the timing-movement correlations from 99+% to 93% and to reduce the probability of the grassy knoll shot from 95+% to 77.7% (and only by introducing two severe errors into their calculations).

It is even more crucial to understand that the Decker crosstalk hoax was based on the demonstrably false assumption that Channel 2 stopped recording for about 60 seconds. You don't need to be a scientist to understand that if Channel 2 had stopped recording for 60 seconds, the police dispatcher's subsequent time notations would reflect such a pause, but this did not happen. There is no time missing between the 12:30 and 12:32 transmissions, and the 12:35 and 12:36 time notations occur exactly five and six minutes respectively after the 12:30 time notation, proving, at least on this planet, that Channel 2 could not have stopped recording for 60 seconds (nor for 35 seconds). Dr. Thomas:

The linear regression analysis of the dispatcher's time notations proves that the Audograph machine must have shut off for extended times prior to the assassination. But after 12:30, the approximate time of the shooting, the dispatcher's announced times and the actual elapsed time fall into very close agreement for the six minutes after the shooting. There did not seem to be any appreciable amount of time missing, and none between 12:30 and 12:32 when the relevant broadcasts were made and where a full minute of time is supposed to be missing according to the NRC Panel. That is, there is exactly 120 seconds of playback time between the dispatcher's time notations at 12:30 and 12:32. . . .

Note for example (Table 15) that the dispatcher's time notation for 12:32 occurs exactly two minutes after the notation at 12:30. The NRC panel's theory holds that the recorder stopped for a half minute during this interval. It is indeed possible that the real interval between the time notations was actually two and a half minutes apart and by coincidence the lost 31 seconds only makes it appear that no time was lost. But if this were the case, one would expect to see an offset in the time notations downstream. But there is not. The 12:35 and 12:36 time notations fall exactly five and six minutes respectively after the 12:30 time notation, suggesting that the recording is continuous. . . . (Hear No Evil, 2010, pp. 638-639)     

So let us return to the Linsker group and Dr. Thomas's 2001 article. As mentioned, using the NRC/NAS panel's own timing calculations, Dr. Thomas showed that the Bellah "you want" transmission, which the panel acknowledged was crosstalk, was a far more probable timing indicator than the Decker "hold everything" transmission.

In order to refute Dr. Thomas's argument, Linsker and his colleagues had to make a painful admission when they finally submitted their rebuttal in 2005: they had to admit that the NRC/NAS panel's timing calculations were badly off the mark because they had miscalculated the needle-skip adjustment as 60 seconds when in fact it was 35 seconds.

But this was the poster child for a "ruinous victory," i.e., a victory that does fatal damage to the victor. Why? Because, in proving the Bellah crosstalk was not the best time indicator, Linsker and his colleagues were forced to admit that the only way the Decker "hold everything" transmission could be crosstalk was if Channel 2 stopped recording for 35 seconds. This version of the recording-pause theory faced the same unanswerable objection that the NRC/NAS version of the theory faced: a substantial pause on Channel 2, whether 60 seconds, or 44 seconds, or 35 seconds, would cause the dispatcher's subsequent time notations to reflect such a pause, but they do not.

Again, as many scholars have noted, the 12:35 and 12:36 time notations occur exactly five and six minutes respectively after the 12:30 time notation, and there is no time missing between the 12:30 and 12:32 broadcasts. How could this be if Channel 2 stopped recording for 35 seconds? Linsker et al. offered no explanation for why the alleged 35-second pause does not show up in the dispatcher's subsequent time notations. This is one of the facts that caught Dr. David Kaiser's attention and caused him to reject the attacks on the acoustical evidence.

And, as discussed in previous replies, subsequent research by BBN scientists from 2015-2019 has proved that the Decker transmission is an overdub and that the Fisher "I'll check" transmission is crosstalk, which proves that the dictabelt's impulse patterns were recorded during the assassination. Dr. Josiah Thompson discusses this historic new research at length in his book Last Second in Dallas. BBN scientists Dr. James Barger and Dr. Richard Mullen each wrote an appendix for the book.

Groden's matching of the film and acoustic data.

The best CT alternative I could offer is that Oswald was involved with the shooter.

Oswald brought the MC rifle onto the TSBD that morning and hid it in the attached garage part just before he then went into TSBD thru the back door.

The shooter if not some other employee, would have had to been disguised as perhaps a contract worker. He retrieved the bagged disassembled rifle from where Oswald had hidden it in the annex bldg.

The shooter took the bag to the 7th floor and assembled the rifle , probably between 11:45-12:00.

The shooter then remained hidden on the 7th floor until about 12:10 when he took the assembled rifle (covered with the bag )in case he was inadvertantly seen coming down to 6th floor landing by somebody coming up stairs from 5th floor.

The shooter had checked out the 6th floor at 12:00 thinking it was clear but BRW came up unseen by the shooter at 12:05 as the shooter went back up to 7th floor to get the rifle.

When the shooter returns to the 6th floor carrying rifle in bag, he was planning to shoot from the SW window. He was surprised as he approached the SW window to notice BRW was at the SE window. Thus he was only momentarily sighted by Arnold Rowland at 12:15.

The shooter backed away from the SW window,put the  rifle back in the bag ( in case another unexpected person might appear) , moved himself with bag in hand to the NE corner of the 6th floor behind some boxes where he could wait and see if BRW would leave the floor.

The shooter saw BRW leave the floor by 12:24. The shooter then had has potentially 2-3 minutes to have arranged 3 boxes stacked as a rifle rest. The shooter was wearing gloves which is why he left no fingerprints on the boxes, the bag, and the rifle. The Oswald print on one of the boxes was merely coincidence of Oswald having  handled MANY boxes when he was helping move boxes earlier.

The shooter took the rifle out of the bag and left the bag there in the SN. He lowered the window and placed the box on the window ledge just before the Bronson film started.

The shooter sat on one box and kept himself out of sight during Bronson film and Hughes film.

The shooter hid  the MC rifle between the boxes near the staircase as early as 25 seconds post shots  because he could run faster than 8ft/sec, not having to wipe prints from rifle while running with it.

Just one question. Other than BRW showing up, is there any evidence that any of this happened?

Why do you need and alternative to the WCR narrative? OK. That's two questions.

The "war" is not costing much. Many of those are sunk costs regardless of whether they are engaged in a conflict or floating around the world.  The costs are certainly much less than the harm that Iran would cause if they were allowed to develop and use a nuclear weapon.  How much did 9/11 eventually cost us because Bill Clinton put politics ahead of taking out bin Laden when he had the chance?  I do agree, however, that the overall military budget is not sustainable.  Trump's addition is a grain of sand compared to decades long accumulation of debt.  Politicians don't want to be the bearer of bad news.  They feel as though that they can't get elected stating truths such as the socialist programs at not sustainable given all the spending.  How many billions were wasted or stolen in fraud using COVID as a pretext?  They will wait until it collapses rather than acknowledge that reforms are necessary.

Hold on. You're not calling it a war? - So, do u prefer conflict? 
  but not actual war, huh? - Fox News propaganda is very effective indeed.

The opening frame of the Darnell footage is less than 20 seconds after the headshot.
At the time of the opening frame Weigman, is filming the Hesters.
He finishes filming around 17 seconds after the headshot.
Four or five seconds into this footage we see Weigman running down the knoll to where the Newmans are.

    Nobody has detailed the route Wiegman took: (1) from the point we see him stumbling/falling on the Bell Film, to, (2) the point we see him standing at the bottom of the Knoll. Point (1) and Point (2) are Not inline. The Wiegman story has always been that he Stopped Filming when he ran Down the knoll. Now, we know that Wiegman was also Not Filming when he moved from point (1) to place him inline with point (2). This expands the Wiegman Tick/Tock. If Wiegman stumbled and then Fell as he moved into position to run down the knoll, this would be additional Tick/Tock.
     "Pictures Of The Pain" details that Wiegman saw SA Lem Johns UP the knoll. Is it during the above time frame that Wiegman saw SA Johns? Wiegman claiming to have seen SA Johns UP the knoll, is contrary to Johns claiming that he never left Elm St after jumping out of the LBJ SS Car. For its' initial 30 yrs, the Wiegman Film was ballyhooed as being filmed "continuously". Did Wiegman actually continue filming while he moved between points (1) and (2) and film SA Lem Johns UP the knoll? This possible "lost" footage would also be "lost" Tick/Tock. To this day, NBC has steadfastly refused to release the Original Wiegman film.   

...and about $8 trillion++ of that national debt belongs to Donald Trump
How much does his war in Iran cost everyday?

The "war" is not costing much. Many of those are sunk costs regardless of whether they are engaged in a conflict or floating around the world.  The costs are certainly much less than the harm that Iran would cause if they were allowed to develop and use a nuclear weapon.  How much did 9/11 eventually cost us because Bill Clinton put politics ahead of taking out bin Laden when he had the chance?  I do agree, however, that the overall military budget is not sustainable.  Trump's addition is a grain of sand compared to decades long accumulation of debt.  Politicians don't want to be the bearer of bad news.  They feel as though that they can't get elected stating truths such as the socialist programs at not sustainable given all the spending.  How many billions were wasted or stolen in fraud using COVID as a pretext?  They will wait until it collapses rather than acknowledge that reforms are necessary.