Understanding the files on the DVD of Arirang Karaoke (hk2 & midi0)

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Re: Arirang Vol. 31 Song List (Chinese sorted)

Ishisashi
Since the most-significant byte of length info are likely to be 0, it is possible to find the mask itself from the length info?

38 03 03 34 36 2E 31 30 2E 30 2E 4E 2C 46 6E 2C 42 6E 0E 09 23 53 4A 53 46 23 4F 4A 4D 46 0E 09 0E 09 0E 09 0E 09 23 23 23 23 23 23 23 23 23 23 23 4A 6D 70 77 71 76 6E 66 77 62

From the third byte (little-endian integer), it can be seen that the mask is 0x03.
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Re: Arirang Vol. 31 Song List (Chinese sorted)

Ishisashi
Disc B MUN99603.DAT
I manually identified the offsets and masks for the first 15 songs based on this idea.

|Kumyoung no.|Title|Offset|Mask|
|-|-|-|-|
|124|결혼 행진곡 (신부 입장)|0xE7000|0x00|
|550|애 국 가(1절)|0xEA000|0x5A|
|564|어머니의 마음|0xEF000|0x48|
|931|LAST CHRISTMAS|0xF9800|0x59|
|1000|졸업식 노래|0x10F000|0x18|
|1024|어린이날 노래|0x115000|0x00|
|1025|어머님 은혜|0x119000|0x7B|
|1051|ADORO|0x166800|0x61|
|1052|All For The Love Of A Girl|0x171800|0x60|
|1053|AND I LOVE HER|0x179000|0x63|
|1054|As tears go by|0x183000|0x62|
|1055|Autumn Leaves|0x21F800|0x61|
|1056|Bad Case Of Loving You|0x362800|0x60|
|1057|Before The Dawn|0x510000|0x5B|
|1058|Bridge Over Troubled Water|0x516800|0x5A|

The current issue is, where are the offsets and masks stored?
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