Jump to content
Sign in to follow this  
MrCheeze

patch B2W2 mod: Different battle music for each trainer class!

Recommended Posts

Because nobody ever really understood how trainer music was determined until now, and it seems like a useful feature to have.

Alright so for this you're gonna want to extract your rom and decompress a couple of the files. I normally use ndstool and blz.exe to do this:

ndstool -x originalromname.nds -9 arm9.bin -7 arm7.bin -y9 y9.bin -y7 y7.bin -d data -y overlay -t banner.bin -h header.bin
copy arm9.bin arm9decomp.bin
blz -d arm9decomp.bin
copy overlay\overlay_0036.bin overlay_0036decomp.bin
blz -d overlay_0036decomp.bin

Now we need to make a few changes to our decompressed overlay 36. They change slightly based on version.

Black 2:

offset 0x46BA0: change
6A F6 10 FB 07 1C 01 98 6A F6 FA FA 0E 2F 08 D2 18 49 7A 00 89 5A 03 B0 21 80
->
1C 49 82 00 89 5C 21 70 6A F6 0C FB 07 1C 01 98 6A F6 F6 FA 0E 2F 04 D2 03 B0

(This rearranges things so that the music table is indexed by trainer class, instead of by battle intro.)



offset 0x46C0C: change 20 80 -> 04 48
(Trainers without a battle intro are hardcoded to use the regular battle music. This replaces the code that does that with a NOP.)


offset 0x46C14: change E4 28 1D 02 -> 95 23 09 02
(Repoint the location of the music table, the original one isn't large enough for us.)

White 2:

offset 0x46B98: change
6A F6 0A FB 07 1C 01 98 6A F6 F4 FA 0E 2F 08 D2 18 49 7A 00 89 5A 03 B0 21 80
->
1C 49 82 00 89 5C 21 70 6A F6 06 FB 07 1C 01 98 6A F6 F0 FA 0E 2F 04 D2 03 B0

(This rearranges things so that the music table is indexed by trainer class, instead of by battle intro.)



offset 0x46C04: change 20 80 -> 04 48
(Trainers without a battle intro are hardcoded to use the regular battle music. This replaces the code that does that with a NOP.)


offset 0x46C0C: change 18 29 1D 02 -> C1 23 09 02
(Repoint the location of the music table, the original one isn't large enough for us.)

Now, this change will affect how big the file is when compressed, so we need to edit a table in y9.bin to take that into account open it up, go to offset 0x49C, and change it from 58 E9 03 -> 5C E9 03 for Black 2 or 30 E9 03 -> 34 E9 03 for White 2.

Finally, we insert the music table itself. Originally the game contains a table for each of the 236 trainer classes in the form AA GG EE EE, where AA is unknown, GG is gender, and EE EE is the encounter (not the battle) music. The gender field isn't really used for much of anything, so we're just gonna overwrite it with a field for battle music. Note that we only have one byte to work with, so we're restricted to music in the range 0400 to 04FF, but that includes pretty much everything anyway. Now, open your decompressed arm9, and go to 0x8E394 for Black 2 or 0x8E3C0 for White 2. Here, you want to replace

00 00 5A 04
01 01 5A 04
02 00 5A 04
03 01 5B 04
04 00 5A 04
05 01 5B 04
06 01 64 04
07 00 64 04
08 00 65 04
09 01 65 04
0A 00 5A 04
0B 00 5A 04
0C 00 5A 04
0D 01 5F 04
0E 01 5C 04
0F 00 5C 04
10 01 5C 04
11 00 5A 04
12 01 5F 04
13 01 5A 04
14 00 5A 04
15 01 5A 04
16 00 5A 04
17 01 5A 04
18 00 5D 04
19 01 5D 04
1A 00 65 04
1B 00 64 04
1C 01 64 04
1D 00 64 04
1E 00 63 04
1F 00 5E 04
20 00 63 04
21 00 66 04
22 01 65 04
23 00 61 04
24 01 61 04
25 00 5A 04
26 01 5A 04
27 00 5A 04
28 00 5A 04
29 00 5A 04
2A 01 5B 04
2B 00 65 04
2C 00 65 04
2D 00 64 04
2E 01 62 04
28 00 5A 04
2F 01 5F 04
30 01 5D 04
31 00 5D 04
32 00 61 04
33 00 62 04
34 00 64 04
35 00 5A 04
36 01 5A 04
37 00 5A 04
38 00 5E 04
39 00 65 04
3A 00 63 04
3B 01 63 04
3C 00 65 04
3D 01 65 04
3E 00 5E 04
3F 01 61 04
40 01 5F 04
41 00 65 04
42 00 65 04
43 00 63 04
44 01 63 04
45 00 5D 04
46 01 5D 04
47 00 61 04
48 00 64 04
49 00 64 04
4A 01 66 04
4B 00 66 04
4C 01 5A 04
4D 01 5A 04
4E 00 5A 04
4F 00 5A 04
50 01 5A 04
51 00 5A 04
52 00 65 04
53 00 60 04
54 01 5F 04
55 00 65 04
56 01 66 04
57 00 5A 04
58 00 5A 04
59 00 60 04
5A 01 60 04
47 00 61 04
04 00 5A 04
46 01 5A 04
4A 01 5A 04
4B 00 5A 04
45 00 5D 04
2A 01 5A 04
29 00 5A 04
5B 01 5A 04
28 00 5A 04
5C 00 5A 04
5D 00 5A 04
33 00 62 04
49 00 64 04
23 00 61 04
24 01 61 04
45 00 5D 04
46 01 5D 04
31 00 5D 04
30 01 5D 04
5E 01 5A 04
5F 00 5A 04
60 01 5A 04
61 00 5A 04
62 01 5A 04
63 00 5A 04
64 00 5A 04
65 00 5A 04
66 00 5A 04
67 01 5A 04
68 00 5A 04
69 01 5A 04
6A 01 5A 04
6B 00 5A 04
6C 00 5A 04
6D 00 5A 04
6E 00 5A 04
6F 01 5A 04
70 00 5A 04
71 00 5A 04
72 01 5A 04
73 00 5A 04
74 01 5A 04
75 01 5A 04
76 01 5A 04
77 00 5A 04
78 00 5A 04
79 01 5A 04
7A 00 5A 04
7B 01 5A 04
7C 00 5A 04
7D 01 5A 04
7E 00 5A 04
7F 00 5A 04
80 01 5E 04
11 00 5A 04
11 00 5A 04
12 01 5F 04
12 01 5F 04
18 00 5D 04
18 00 5D 04
19 01 5D 04
19 01 5D 04
57 00 5A 04
57 00 5A 04
31 00 5D 04
31 00 5D 04
30 01 5D 04
30 01 5D 04
45 00 5D 04
45 00 5D 04
46 01 5D 04
46 01 5D 04
5C 00 5A 04
5C 00 5A 04
81 00 5A 04
82 01 5A 04
83 01 5A 04
84 01 5A 04
85 00 5A 04
86 00 5A 04
87 01 5A 04
88 00 5A 04
89 00 5A 04
8A 00 5A 04
8B 00 5A 04
8C 00 5A 04
8D 01 DB 04
8E 00 5A 04
8F 01 5A 04
90 00 5A 04
91 01 5A 04
92 00 5A 04
93 01 5A 04
94 00 5A 04
95 00 67 04
96 01 67 04
97 00 5A 04
98 00 5A 04
99 00 5A 04
9A 00 5A 04
9B 01 5A 04
9C 00 5A 04
94 00 5A 04
49 00 5A 04
61 00 5A 04
9B 01 5A 04
9D 00 5A 04
9E 01 5A 04
9F 00 5A 04
A0 01 5A 04
A1 00 5A 04
A2 01 5A 04
A3 00 5A 04
A4 01 5A 04
A5 00 5A 04
A6 01 5A 04
A7 00 5A 04
A8 01 5A 04
A9 00 5A 04
AA 00 5A 04
AB 00 5A 04
AC 01 5A 04
AD 01 5A 04
AE 00 5A 04
AF 01 5A 04
B0 00 5A 04
B1 00 5A 04
B2 01 5A 04
B3 01 5A 04
B4 00 5A 04
B5 00 5A 04
B6 01 5A 04
B7 00 5A 04
B8 01 5A 04
B9 00 5A 04
32 00 61 04
3F 01 61 04
2E 01 62 04
2B 00 65 04
BA 00 5A 04
20 00 DC 04
BB 00 5A 04
94 00 5A 04

with

00 6A 5A 04
01 6A 5A 04
02 6A 5A 04
03 6A 5B 04
04 6A 5A 04
05 6A 5B 04
06 6A 64 04
07 6A 64 04
08 6A 65 04
09 6A 65 04
0A 6A 5A 04
0B 6A 5A 04
0C 6A 5A 04
0D 6A 5F 04
0E 6A 5C 04
0F 6A 5C 04
10 6A 5C 04
11 6A 5A 04
12 6A 5F 04
13 6A 5A 04
14 6A 5A 04
15 6A 5A 04
16 6A 5A 04
17 6A 5A 04
18 6A 5D 04
19 6A 5D 04
1A 6A 65 04
1B 6A 64 04
1C 6A 64 04
1D 6A 64 04
1E 6A 63 04
1F 6A 5E 04
20 6A 63 04
21 6A 66 04
22 6A 65 04
23 6A 61 04
24 6A 61 04
25 6A 5A 04
26 6D 5A 04
27 6A 5A 04
28 71 5A 04
29 6A 5A 04
2A 6A 5B 04
2B 6A 65 04
2C 6A 65 04
2D 6A 64 04
2E 6A 62 04
28 6A 5A 04
2F 6A 5F 04
30 6A 5D 04
31 6A 5D 04
32 6A 61 04
33 6A 62 04
34 6A 64 04
35 6A 5A 04
36 6A 5A 04
37 6A 5A 04
38 6A 5E 04
39 6A 65 04
3A 6A 63 04
3B 6A 63 04
3C 6A 65 04
3D 6A 65 04
3E 6A 5E 04
3F 6A 61 04
40 6A 5F 04
41 6A 65 04
42 6A 65 04
43 6A 63 04
44 6A 63 04
45 6A 5D 04
46 6A 5D 04
47 6A 61 04
48 6A 64 04
49 6A 64 04
4A 6A 66 04
4B 6A 66 04
4C 6A 5A 04
4D 6F 5A 04
4E 6F 5A 04
4F 6F 5A 04
50 6F 5A 04
51 6A 5A 04
52 6A 65 04
53 6A 60 04
54 6A 5F 04
55 6A 65 04
56 6A 66 04
57 6A 5A 04
58 6A 5A 04
59 6A 60 04
5A 6A 60 04
47 6A 61 04
04 6A 5A 04
46 6A 5A 04
4A 6A 5A 04
4B 6A 5A 04
45 6A 5D 04
2A 6A 5A 04
29 6A 5A 04
5B 79 5A 04
28 6A 5A 04
5C 6A 5A 04
5D 6A 5A 04
33 6A 62 04
49 6A 64 04
23 6A 61 04
24 6A 61 04
45 6A 5D 04
46 6A 5D 04
31 6A 5D 04
30 6A 5D 04
5E 6C 5A 04
5F 6C 5A 04
60 6C 5A 04
61 6C 5A 04
62 6C 5A 04
63 6C 5A 04
64 6C 5A 04
65 6C 5A 04
66 6A 5A 04
67 6A 5A 04
68 6A 5A 04
69 6A 5A 04
6A 6A 5A 04
6B 6A 5A 04
6C 6A 5A 04
6D 6A 5A 04
6E 6A 5A 04
6F 6A 5A 04
70 6A 5A 04
71 6A 5A 04
72 6A 5A 04
73 6A 5A 04
74 6A 5A 04
75 6A 5A 04
76 6A 5A 04
77 6A 5A 04
78 6A 5A 04
79 6A 5A 04
7A 6A 5A 04
7B 6A 5A 04
7C 6A 5A 04
7D 6A 5A 04
7E 6A 5A 04
7F EE 5A 04
80 6A 5E 04
11 6A 5A 04
11 6A 5A 04
12 6A 5F 04
12 6A 5F 04
18 6A 5D 04
18 6A 5D 04
19 6A 5D 04
19 6A 5D 04
57 6A 5A 04
57 6A 5A 04
31 6A 5D 04
31 6A 5D 04
30 6A 5D 04
30 6A 5D 04
45 6A 5D 04
45 6A 5D 04
46 6A 5D 04
46 6A 5D 04
5C 6A 5A 04
5C 6A 5A 04
81 6A 5A 04
82 6A 5A 04
83 6A 5A 04
84 6A 5A 04
85 6A 5A 04
86 6A 5A 04
87 6A 5A 04
88 6A 5A 04
89 6A 5A 04
8A 6A 5A 04
8B 6A 5A 04
8C 6A 5A 04
8D 6A DB 04
8E 6A 5A 04
8F 6A 5A 04
90 6A 5A 04
91 6A 5A 04
92 6A 5A 04
93 6A 5A 04
94 EA 5A 04
95 E9 67 04
96 E9 67 04
97 EB 5A 04
98 6A 5A 04
99 F3 5A 04
9A E9 5A 04
9B EC 5A 04
9C 6A 5A 04
94 6A 5A 04
49 6A 5A 04
61 6D 5A 04
9B 6A 5A 04
9D 6A 5A 04
9E 6A 5A 04
9F 6A 5A 04
A0 6A 5A 04
A1 6A 5A 04
A2 6A 5A 04
A3 6A 5A 04
A4 6A 5A 04
A5 6A 5A 04
A6 6A 5A 04
A7 6A 5A 04
A8 6A 5A 04
A9 6A 5A 04
AA 6A 5A 04
AB 6A 5A 04
AC 6A 5A 04
AD 6A 5A 04
AE 6A 5A 04
AF 6A 5A 04
B0 6A 5A 04
B1 6A 5A 04
B2 6A 5A 04
B3 6A 5A 04
B4 6A 5A 04
B5 6A 5A 04
B6 6A 5A 04
B7 6A 5A 04
B8 6A 5A 04
B9 ED 5A 04
32 6A 61 04
3F 6A 61 04
2E 6A 62 04
2B 6A 65 04
BA 6A 5A 04
20 6A DC 04
BB 6A 5A 04
94 EA 5A 04

This will assign each trainer class the same music they had in the vanilla game. Obviously this is not very useful, so go ahead and edit that second column to assign whatever music you like to each trainer class. You can use BWTE or something to remind yourself what order the 236 classes come in.

Once you've done that, it's time to rebuild the rom. Which brings us to the bad news. Even though we didn't change the size of the decompressed arm9, our changes still affect what size it is after compression, which for some reason causes major issues when rebuilding the rom. One way to solve this is to just insert the decompressed arm9, instead of compressing it first. This basically solves the issue, but at a cost: the game will now supposedly only be compatible with emulators, not an actual DS.

copy overlay_0036decomp.bin overlay\overlay_0036.bin
blz -en overlay\overlay_0036.bin
ndstool -c newromname.nds -9 arm9decomp.bin -7 arm7.bin -y9 y9.bin -y7 y7.bin -d data -y overlay -t banner.bin -h header.bin

Obviously this is not ideal, so if anyone knows how to insert a compressed arm9.bin with a different size from the original WITHOUT making the game impossible to boot, please let me know. But either way, hope someone finds all this useful.

Edited by MrCheeze
  • Like 1

Share this post


Link to post
Share on other sites

This pretty much replaces the existing code for determining battle music with something else entirely, so not an easy thing to just port to gen 4 unfortunately.

But just for your information, this was made with the help of Bond697's partial disassembly here, as well as some of my own reverse engineering work.

  • V-Wheeeeeel!!! 1

Share this post


Link to post
Share on other sites
14 hours ago, MrCheeze said:

This pretty much replaces the existing code for determining battle music with something else entirely, so not an easy thing to just port to gen 4 unfortunately.

But just for your information, this was made with the help of Bond697's partial disassembly here, as well as some of my own reverse engineering work.

That's cool, thanks a lot :D

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×
×
  • Create New...