Nice finding !
In fact, few years ago, there was on the PSU official forum a tutorial made by... I don't remember who, which explained how to make custom music for the game. I didn't have any interest on it, but I found it cool how easy it was to "extract" (and eventually convert) music from this game, that I decided to list "almost" every tracks (and propose a batch file, that you have partially on the 1st post, to make this easier).
In fact, by ignoring .adx added to archives, the latest version of PSU:AotI includes 191 .adx
The list has only 130 entries. Why that ?
Because it was based on the in-game jukebox. That explains the typo I kept for "Raia" and "Eathan" (they were existant ingame :
I thought I'd have the Raia variant, but... I don't. Or I lost it).
Tracks order, which follow the tracks order in the jukebox (sadly, I haven't "screenshot-ed" it, and the PSPo2i one is different). Because I thought it'd be more convenient for modders, and because I've checked every file online (you'll understand later), tracklist name (they are as they were in-game, and may be different to what they are on differents OSTs).
Folders ("md BGM\PSU", "md BGM\PSPo", etc..) are my own, simply to sort tracks by game (in-game, iirc, tracks were divided on three pages)
But because Gmarch wasn't in the jukebox, I somewhat missed it.
For obvious reason, in addition to the jukebox music disc I decided to list the "bonus tracks".
So... What are the 61 others .adx ?
6ccb10e8efc08822cfba6ec3454d8a18 - Casino - Win
77dd8b3024bb6b16c1557e0e92ba912f - I expect it to be related to the casino but, afak, it was never used. Probably bankrupt.
2027abc764c2970b422ddd4bdf3ca963 - Casino - Slot - Small gain during Fever iirc
80d11a9806ab49509c85f348786982af - Casino - Slot - Jackpot/big gain during Fever iirc
2c9133c1f0eeed16d53c2ecb2a16ea5d - Spaceship S.E.
5c218f4226701b573cd07ed06a889911 - Spaceship S.E.
95e2afc09fac6a2e6ba84489d113b081 - Spaceship S.E. & BGM
6a81f4e61fae59c07cfcfd15c9da0d8a - Spaceship S.E. & BGM
All of these are boss intro/outro :
2ef11d684a45837236062f2c6588d2b5 - Dark Falz Intro
2f781c8eaf076d73af79c4f5e74d8890 - Dark Falz Outro
228281463fa23868d55c25832f3ea620 - Mother Brain Intro
7cd5031e76d927c10c38698e9b6c9dd2 - Mother Brain Outro
I never searched to identify them because, excepted Mother Brain and Dark Falz, it has no interest in my eyes.
788f9c807fd0ce5a2ca57989c97f6656 - Game Over (only used in Story Mode)
da4b61bf8b9dbf915b299ce02bfc3be8 - Silent ; may be interesting to know if it was used (and when/why)
The 4 following tracks are part of the "Disc 026 - Comedy". They're all used in Story Mode. Maybe they were also used during some events (Dengeki Maybe ?).
8607b4c0e0078d329fb38280caea8da2 - Called "Happy End" in PSPO2i (Disk 46)
4cdc35c72bd9fce4ef2e079f76fb3698 - Called "Warmth" in PSPo2i (Disk 31)
e0bb1ad20c19d815a0dcdbb561f898f5 - Called "Funny" in PSPo2i (Disk 30)
b010f16aa44d50098af69772c2bd4ded - Called "Dubious" in PSPo2i (Disk 29)
I never seen the interest of these, because SEGA could virtually generate them by simply create loops in the original track.
ebc1cfc85432ae187d6133aee86470da - Result Screen (good)
4a232beb7e19109e7c52f8f3891dc953 - Result Screen (bad)
Some variants of the main themes :
3c2e73c4453324ce6e1bea838e4161c6 - Save This World - Orchestra Short Version 2 -
00ab44366553c9ab5e05acba10c16680 - For Brighter Day - Short Version -
7327ea6caa8f1a739455ae31b25ccfa4 - For Brighter Day - Orchestra Short Version -
f7f6c7e40b6dfa87b061cb4635d48941 - For Brighter Day - Remix Short Version -
f7817a9427049eaa54fc1548801f31c0 - With You - Extra Short Version -
82632901ae8ffe23f4d57d26d90d9097 - With You - Short Version -
5aced909abb4534409afdcf95e329a30 - With You - Instrumental -
d018713d4a1fc62c2ec73a488e56e9b7 - Mirei - Short Version -
c8639b8b3afcd3de5c74dc9d07f6fb7b - Mirei - Long Version -
Don't know if they're used.
35acae7ccb21b8857332b869e965406f - Like Matriotix said, "G March" (a.k.a. Counter Mission hymn)
Some PSO Tracks that deserved to be in the jukebox, but they are not (and no one know why) :
8867241135a197bf86f86de3cda0fdbc - Mother earth of dishonesty PART2
223faa4ed1db4e770cdcc38dd1e19a3e - The kink in the wind and the way PART2
f3f5325f2e0f600962b89e6cadd7dd9b - Empty space out of control PART2
a531649d2659f394fa70dfc9879ea626 - Revolution to the origin PART2
Duplicate of two PSU tracks :
84165eab3e9f115722b1f4881d5cd9f5 - Copy of 5ca355ff67a177563c0be89256f82a9d "056 - Z.C.Enemy 1.adx"
6b3028a4225813da92604795c6b99203 - Copy of c82ced14f244d8e55db6d006a53d2034 "057 - Z.C.Enemy 2.adx"
No idea if they were used, but only the originals were in the jukebox.
ba7332e066b5a4fcba4f68562222f5c0 - I can't figure what is it, even with the OST (quite sure I've already heard it in-game).
To finish on another anecdotes, on this list, I had to romanize some track names. Don't remember why (probably it causes the batch command to dysfunction).
Here's the "affected" tracks, and their correct name in JP :
099 - Kikami Shouten ➝ 麒神衝天
kimishine ➝ きみのためなら死ねる
akadoko ➝ 赤ちゃんはどこからくるの？
For the "Bonus Tracks", I had no idea how to name them (and how to sort them).
And how can I be sure to haven't missed any tracks ?
I've made a copy of the entire data file, used a batch file to add to every file the .adx extension, I've opened all the 2177 files with foobar2000 (and the foo_input_vgmstream plug-in), and only kept tracks that have a duration (which means they are truly .adx). Stupid, but efficient.
So, now, people have the entire list of *.adx used in-game.
And thanks for having corrected the bug which prevented me to post (or create a new thread).