Hey Gamma V, try putting the main map music value as 00 and see if it works. In case it doesn't, I can provide you a fix, since I made a little uberASM code for myself that allows variable custom music in a same submap depending on certain stuff. I'd just need to do a little tweak, but that won't take any long.
If you mean for me to try setting it to 00 in Lunar Magic, I tried that once. It did nothing but cause the previously-playing song to continue. I am using UberASM on the Overworld for HDMA gradients. Apparently, that's not what's bugging up the music-loading on the now-split main map. I set up a new ROM and installed every bit of ASM BUT UberASM, but the same thing happened. I checked my other patches for writes to $1DFB and only found them in the SMB1 Flagpole patch, in which they're kinda necessary to make the level clear fanfare play.
UPDATE: Thanks to Kaizoman, the issue with the Submap Split Patch's music loading has been fixed. Now I can move on and finish this hack, starting with 4-1.
This is pretty much your average forest level.
Expect plenty of Wigglers and hostile plantlife.
There are also Lakitus hanging out in some of the pipes, and they're all too happy to pop out and toss a Spiny at you.
VIDEO
Quintesson Judge: Silence, or you will be held in contempt of this court!
Hot Rod: I have nothing but contempt for this court!
- Transformers the Movie (1986)