BCWAV/BCSTM Notes

MAGIC: CWAV
0x0A: 01
0x0C: File Size
0x16: 00 70 (INFO)
0x1C: INFO Size
0x20: 01 70 (DATA)
0x24: DATA Size

MAGIC: CSTM
0x0A: 00
0x0C: File Size
0x14: 00 40 (INFO)
0x1C: INFO Size
0x20: 01 40 (SEEK) -Note: If SEEK isn't wanted, DATA can be placed here.
0x28: SEEK Size
0x2C: 02 40 (DATA)
0x34: DATA Size

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MAGIC: INFO

PCM16/PCM8:

BCWAV:
49 4E 46 4F II II 00 00 WW VV 00 00 XX XX 00 00
YY YY 00 00 ZZ ZZ ZZ ZZ 00 00 00 00 NN NN 00 00
00 71 00 00 14 00 00 00 00 71 00 00 28 00 00 00
00 1F 00 00 18 00 00 00 00 00 00 00 FF FF FF FF
00 00 00 00 00 1F 00 00 PP PP PP PP 00 00 00 00
FF FF FF FF 00 00 00 00 00 00 00 00 00 00 00 00

0x04: INFO Size (I)
0x08: Type (W)
0x09: Enables Loop, if loop is present and this is not enabled, song will only loop once and play to end. (V)
0x0C: Sample Rate (X)
0x10: 01 if looped, but byte doesn't do anything. (Y)
0x14: Sample Count (Z)
0x1C: Channel Count (N)
0x48: Pointer to second channel (P)

BCSTM:
49 4E 46 4F II II 00 00 00 41 00 00 18 00 00 00
01 01 00 00 50 00 00 00 01 01 00 00 5C 00 00 00
WW VV NN NN XX XX 00 00 YY YY 00 00 ZZ ZZ ZZ ZZ
?? ?? 00 00 00 20 00 00 00 10 00 00 ?? ?? ?? ??
?? ?? ?? ?? ?? ?? ?? ?? 04 00 00 00 00 10 00 00
00 1F 00 00 18 00 00 00 01 00 00 00 01 41 00 00
20 00 00 00 02 00 00 00 02 41 00 00 28 00 00 00
02 41 00 00 30 00 00 00 7F 40 00 00 00 01 00 00
0C 00 00 00 02 00 00 00 00 01 00 00 00 00 00 00

0x04: INFO Size (I)
0x20: Type (W)
0x21: Enables Loop, if loop is present and this is not enabled, song will only loop once and play to end. (V)
0x22: Channel Count (N)
0x24: Sample Rate (X)
0x28: 01 if looped, but byte doesn't do anything. (Y)
0x2C: Sample Count (Z)

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MAGIC: DATA
0x04: DATA Size (Same as above)
0x20: Channel 1 Starts
0x2020: DATA Sections for BCSTM and BCWAV are different starting here.

DATA for BCSTM and BCWAV are not 1:1, Channels are stored differently.

BCWAV		BCSTM		SIZE	Channel
0x20		0x20		0x2000	01
0x2020		0x4020		0x2000	01
0x4020		0x8020		0x2000	01
0x6020		0xC020		0x2000	01
0x8020		0xE020		0x2000	01

Channel 2 starts after Channel 1 in the BCWAV.
For BCSTM, Channel 2 starts at 0x2020 for 0x2000 bytes, then at 0x6020 it continues, and so on.
1 0x2000 > 2 0x2000 >1 0x2000 > 2 0x2000 > etc...

Note: Multiple Streams in a BCSTM translate to more channels, the 3ds will call to specific channels if needed.
For example, if there are two streams, each with 2 channels. Channel count will be 4.
It works the same as 2 channels, 1 0x2000 > 2 0x2000 > 3 0x2000 > 4 0x2000 > 1 0x2000 > 2 0x2000 > 3 0x2000 > 4 0x2000 > etc...
If you want to replace said channels, they have to be in the same order.