I took a look at the assembly here and I understand it as increasing the brightness of the screen after the presents logo is loaded. Is it possible to modify the presents screen and load it is two parts? Is the screen brightness only controllable over the entire area or can certain sections be illuminated separately?
Edit: I took a look at the RAM map and it seems like the easiest mod would be to load a second image. The brightness register is the entire screen.
A subtle but nice effect. Something to note is that the comment in the patch is wrong - you don't need a blank song if you use bank $1DFB, not $1DFC. Of course, $1DFC is the default bank used, so inserting a blank song is required if you want to play a sound effect instead of a song.
None of this matters if you aren't using AddmusicK. Note that you shouldn't touch the !Stub define if you aren't using it, otherwise you'll probably crash the SPC700.
The Dropbox link in the description has been changed to a staff FTP link to minimize the chance of it disappearing.
I don't recommend using dropbox, after the experiences where users using dropbox have their links to it being error 404 (extreme cases, mooses's actraiser OST), I've feared that they are going in the same path as photobucket (linking to it are charged). And also, why is it in a text containing