Oh, I see. Makes sense. Didn't notice at all that there's range shift between chapters. And wow do crystal ponies voices really that wide in range? Especially phrases like "Save us!" which look intimidating high. Thanks for explanation.
Also it'll probably be good to add clarification to warning about game crashing. I read it but for some reason thought that crash should occur at the beginning of the custom. So when the song started OK in All Instruments Mode with all connected and joined I thought that problem avoided me and with friends played whole thing only to see Xbox crash message instead of the score screen . I know that's my fault but I think there may be others who come to similar conclusion after reading the warning message.
And another thing. Could you please reupload your "version" of Darude - Sandstorm? I know it's kinda five years old but I'm feeling so itchy to prank someone with it.