Sorry for the delayed response! I have been a little bit busy lately and enjoying summer, etc.
I have an update where I put in your patch, Disch. I have also done some tweaks to the world music in this. I am beginning to be happy with the world music at this point. The Gurgu Volcano one really does not sit right with me, so at the end I might come back and try again on that one.
The song that I can do next really depends on my mood. There are times when I can do the mysterious / evil / hopeful / confident Chaos Temple, and there are times when I can do the viscous / gallant / grinding battle theme. Hopefully I can do the battle music soon because that's the biggest missing piece at this point to make the game somewhat playable. I also have the Prologue that needs to be done and that's a completely different state of mind to do that one.
Based on what I see with the noise channel in Coneria Castle when going through doors, I expect noise to be a problem with battle sound effects. (i.e. cutting the sound effects short.) I may be able to avoid the noise channel or
possibly produce noise with the Namcot-163. But then this takes away a Namco channel from other uses... So I'll play with that and we'll see what happens.
Summer is my big weakness right now. I have a season pass to the local amusement park and there are all sorts of beautiful biking trails here in Minnesota. But on the flip side, it's terrible outside most of the year here so you can expect a lot more progress on this as we get into late fall / winter.
In other news, I found a dual 2.5GHz 64-bit Power Mac G5 at a thrift store for $37.50, which works perfectly, so I ended up with a huge upgrade to my old G4.

The oldest version of Sonic Visualizer runs on the G5 so now I can do audio spectrum analysis directly without jumping over to one of my Windows PCs.
Edit
Oops I forgot the link:
https://sites.google.com/site/benboldt2/files/ff_namcot_world_with_updates.zip