HL:Alyx ARG crowbar

Starting based on the known information that:

radio_number_station_terminator_synthy_01.mp3	SW TX UY
radio_number_station_terminator_synthy_02.mp3	SPTQU
radio_number_station_terminator_synthy_03.mp3	XYZ
radio_number_station_terminator_synthy_04.mp3	OL PM QN
radio_number_station_terminator_synthy_05.mp3	KH LI MJ NK
radio_number_station_terminator_synthy_06.mp3	H I F JK
radio_number_station_terminator_synthy_07.mp3	D EA FB C

I assume this is a pattern of interlaced/interleaved alphabetical letters in order. From this it is obvious there are missing letters.
For example we could create the made up string "AV BW CX DY EZ". If we drop the "Y" for example, resulting in "AV BW CX D EZ" we can still tell what is missing and where it goes.

However in the both the made up case and the real case there are spaces that we don't actually use.
Using our made up example again we can start with "AV BWC XDY E Z", remove the spaces to get "AVBWCXDYEZ".
While those made up strings are only an example, we can still use the same rules on the real ones.

In the case of "XYZ" we have to assume it is using the same pattern as "SW TX UY". This results in "TX UY VZ", which removing spaces gives us "TXUYVZ".

With this insight we can fill in the missing letters (and spacing):

SWTXUY
SPTQUR
TXUYVZ
OLPMQN
KHLIMJNK
DHEIFJGK
DZEAFBGC

If paired together based on duplicate letters we can produce resulting pairs. The "." are just used to space things out so it is easier to read.

SWTXUY
SPTQUR

SWTXUY
..TXUYVZ

.SPTQUR
OLPMQN

TXUYVZ
....DZEAFBGC

.OLPMQN
KHLIMJNK

KHLIMJNK
DHEIFJGK

DHEIFJGK
DZEAFBGC

Next, lay these out in rows and a pattern in the columns emerges.
This is done with concatenation and using those string pairs, while lining up every vertically matching letter into the colunms.

For example using only "KHLIMJNK" and "DHEIFJGK" we can put together the following, where "K" lines up:


DHEIFJGK........
KHLIMJNK........
.......KHLIMJNK.

When we put everything together we get this (vertical order is not important):

...TXUYVZ..............
.......DZEAFBGC........
DZEAFBGC...............
.......DHEIFJGK........
..............KHLIMJNK.
DHEIFJGK...............
.......KHLIMJNK........
........OLPMQN.........
.........SPTQUR........
...........TXUYVZ......
.........SWTXUY........
...........TXUYVZ......
...............DZEAFBGC

If we look for any letter that has no repeat occurance in a single column we get:

ABCORW

If we allow for repeat letter usage in our anagram, I belive the answer is: "crowbar"!

Note: there should be several layouts, but all would give the same answer since the pairs do not change.
Note: aligning everything together only has the benifit of eliminating the letter "V".
Note: using these rules it is impossible to generate a result that has multiples of the same letter, leading to a missing "r" duplicate.

Note: if you cannot see letters lining up, then you will need to view using a monospace font.