Sound Object - Buffering the next track

I’ve got the next track to load, when the first one is done, and after that everything works fine.

I’m trying to make it so that two tracks will buffer in the same manner - but feel like I’m doing things the hard way…

http://www.variablemedium.com/work/ss/code.txt

that is the code

and

http://www.variablemedium.com/work/ss/soundplayer.zip

that is the fla, txt, and audio files

any help - or just a nudge in the right direction would be greatly appreciated…