"Kumikyoku" Automatic Mario in MSU1

I wanted to share my simple attempt to recreate the famous video ( https://www.youtube.com/watch?v=fkqWDrjItrA ) on MSU1

I started with a ROM patched with the original Japanese patch located here: https://www.smwcentral.net/?p=section&a=details&id=6757

However, that patch includes no music, and even normal Super Mario World music is muted. So, I loaded this patched ROM into Lunar Magic. Specifically, I used an old version that was contemporary to when this video was first released. The only change I made was to re-enable music for the level.

I then patched this edited ROM with the MSU1 patch located here: https://www.zeldix.net/t1436-super-mario-world-native

I then found the specific PCM file that played during the level and overwrote it with one I made myself from the original "Nico Nico Douga Medley", with some added silence at the beginning to sync with the game action.

Video of it running on SD2SNES here: https://www.youtube.com/watch?v=ZEOevCmOXvQ

This was the result. Although it seems to start OK, after a bit the music gets out of sync with the game. The original video was probably recorded off of ZSNES or something and the emulation differences probably account for the difference. At least, that's my theory. You can see that most of the checkpoint gates do not even render here, for example, which might screw up the timing. It took several tries before I could get Mario to make it through the whole level, even through it is supposed to be "Automatic" and entirely deterministic.

Oh well. It would have been a neat party trick.
If anyone has any ideas on how to get it to work properly, I might try them.