This song isn't working even if I'm using just the original game's global songs. I have that "echo buffer exceeded total space" error.
How to make it work properly?
First, are you making sure to insert the SMW-compatible version? If you really are inserting that version in particular and if it gives you that error, then you have to do what the quote from the submission's description said.
Originally posted by Description
Note that this song uses a lot of ARAM and as such you will likely need to lower the echo delay to make it work.
You will find
$EF $FE $1D $1D
$F1 $08 $62 $01
in the text file.
See $08 in it? That's the echo delay. Lower that number one by one until it inserts properly.