Yea, I was checking the timing for the OST version of the ending, because things were out of sync, with your patch installed, and noticed the problem, did a number of checks afterwards with differently patched roms to track down which one was causing the problem (needed to add some silence to the beginning of the track, and fade-out/fade-in to eliminate the cross-fade into part 2 of the ending, and add some more silence between the 2 parts. timing's perfect now).
The point at which the lockup causes the unending black screen seems to be if you don't hit the button to advance the text until after the next section's music (I think it was shadow's) ends.
The only way to keep things in sync is to be ready to hit the button to advance the text in Relm's ending as soon as it pops up. (with or without the MSU-1 audio playing, the effect is the same).
October 18, 2017, 02:44:30 am - (Auto Merged - Double Posts are not allowed before 7 days.)
Sorry for the double-post, but I felt my last post too old for just editing this in.
The Music Player patch is compatible with the Dancing Mad MSU-1 mod... Mostly... With some glitching...
With the Music Player patch and the Dancing Mad MSU-1 patch both applied, there is some slight audio glitching when entering/exiting the menu screen (usually just a momentary muting of the sound).
In at least one location, the Returner's Hideout, after Banon joins your party, and you are supposed to get on the raft, if you return to the hideout, exiting the menu screen will mute the music until you change rooms, and the wrong track will play on the screen just outside the Returner's Hideout (not the world map, the screen just outside the cave). This only happens with both patches applied, either one individually is fine.
This is likely not something that can be fixed without the code for the music player patch, since it's not a case of both patches using the same block of data, and frankly is minor enough to not be worth the time to fix (as compatibility is a nice bonus the patch author didn't even consider until I started testing, though I've seen him use the TWUE patch and music player on at least one of his demo videos since then, lol).
My advice: Use just the TWUE + MSU patches (patch with MSU then patch TWUE). If you want to use the music player to listen to the MSU-1 music tracks at some point, copy your rom file, apply the music player patch, use the player to listen to the music, then revert to the patch without the music player to continue playing the game.