New videos of audio tape around the time of the crashes (you might want to download in case they are taken down for whatever reason by the original uploader or aren't available).
The first crash is recorded while the recorders are in the Greenhouse Cafe of the Marriott Hotel, where the roof is a glass enclosure and the location is in between the north and south towers (almost directly south of the north tower, northeast of the south tower).
You can hear the initial low bang on presumably the north face after one of the patrons asks for rootbeer, followed around 5 seconds later by the explosion traveling out of the south face and the debris raining down. It takes nearly 20 seconds for the explosion and debris raining down from the south face to stop sounding like a rapidly traveling jetfuel explosion and more similar to the gentler crackle of fires and falling papers.
Full podcast with released recording from these FBI tapes is here: https://www.iheart.com/podcast/1119...episode/audio-artifact-the-fbi-tape-85955153/
The Naudet brothers video of the north tower impact when paired with this appears to indicate that the initial impact of the plane is muffled, but with the explosion out of the south face being heard and reverberating after explosions of smoke and flame from the east and south faces has occurred.
In contrast, the video taken south of the WTC appears to just have a single loud bang from the impact of the aircraft into the north tower, with any other sounds occurring afterward (such as from falling debris or fires) being too far away or overshadowed by police sirens to be audible.