Alright, I've been tinkering around bgm_ingame.pck.3.x64 lately. The file contains default battle tracks for the most part and some tracks you would hear throughout the game, which isn't limited to certain mission.
To find the file, you'll have to navigate to this path of your unpacked game file folder:
natives\x64\streaming\sound\wwise\bgm_ingame.pck.3.x64 for edit and locating music files <--------- we'll mainly use this
natives\x64\sound\wwise\bgm_ingame.pck.3.x64 for editing the follow steps
natives\x64\sound\wwise\bgm_ingame.bnk.3.x64 for editing loop, which you must not mess this one up, ever
From the mentioned file. I tried figuring out the dynamic soundtrack system on this game and below here are the .wem files I've found in the pack for each character's battle theme. All 3 songs are separated into small parts in order to integrate with the Dynamic system. Keep in mind that these part files, although has numbered, are not sorted out in the way that the song usually play.
Dante's Subhuman (and its part I've tried to sort out)
01.wem - connect between ranks 1
02.wem - b rank 2
09.wem - s rank (you can not kill me)
12.wem - connect between ranks 2
14.wem - d rank
16.wem - fall to b rank after s
17.wem - b rank
19.wem - end of a battle
26.wem - encounter
35.wem - s rank 2 (you can not kill me loop)
36.wem - s rank extension 2
38.wem - connect between ranks 3
47.wem - connect a to s
49.wem - b rank extension 2
52.wem - b rank extension
62.wem - s rank extension
64.wem - begin combat (the first guitar riff)
66.wem - c rank no vocal
69.wem - same as 36 but without vocal
70.wem - s rank extend 3
72.wem - end of combat 2? (i'm not sure on this one)
76.wem - sounds like a vocal fill
78.wem - c rank
Nero's Devil Trigger (these parts of the track aren't sorted out yet)
03.wem
18.wem
20.wem
21.wem
22.wem
23.wem
24.wem
30.wem
42.wem
45.wem
48.wem
51.wem
53.wem
55.wem
60.wem
65.wem
67.wem
74.wem
V's Crimson cloud parts are in the rest of the pack, scattered between Dante's and Nero's although some files are exception which are:
05.wem (divinity statue)
08.wem (I don't know what track this is)
41.wem (divinity statue intro)
56.wem (some kind of drum beat)
58.wem & 63.wem (Inside Nico's Van)
If you got any further details or information, please comment and I will update this thread.
P.S. The DLC tracks aren't dynamic at all so they are not split into parts like default tracks, resulting in easier moddablity. If you are planning on modding those then you can totally ignore this thread.