So now, I'm revisiting this same problem. Apparently, it isn't Riivolution interfering. I just added a few more songs and now it half works.
Originally, I changed the Airship song in Luigi's Mansion (now Dracula's Castle) for Wicked Six (from Sixto Sounds of OCRemix.org) and Theme of Tara in Shadow Moses for Heavens Divide (from MGS Peace Walker) and those two worked fine in Gecko. After that, the info_training.pac file wouldn't cooperate for the new songs I added. Quite frankly, I'm at a

with what to do.
EDIT:
Never mind.... I found the problem....
