Credits

ShinyTilDawn

Step 1

Go to sound.tracks and find the song you want to use

Step 2

Note the index number of the song you want to use

Step 3

Go to 12F836 and select exactly 4 bytes

Step 4

Click [Code] on the left and set the code type to THUMB

Step 5

Change lsl r0, r0, #1 to add r0, r0, #1

Step 6

Change both numbers after # so they add up to the IS of the song you want

ex. if the ID is 257, you can do mov r0, #255 and add r0, r0, #2

Happy Hacking!