How to find G1XFour drum pattern data and encode it

[nopeg]

As I understand decode_pattern finds offset from the bitmap of this header at which actual pattern data is stored

I understand that this script is just a parser that uses construct to decode pattern data from the memory pointed to

The binary search confirmed that the location of the data is at the same offset (I don't know what is the next step)

I need help with understanding some basics of binary search and decoding all this stuff, like how to use decoded patterns to see how this system works.

Sorry in advance for my incompetence