i have beatmania 5th mix , but I clearly notice the slight timing delay in sound in vgs.
The other program I'm talking about is a bm simulator for pc, made by fans of the game (kinda like mugen, but for beatmania).
I even have a small section about it on my site:
http://www.samor.nl/bm98.html
and yep, I made a song for it...did it with notepad. Recently I found out there was an editor as well...duh, could have spared me some time

...oh well, I did manage to find out how the program works though

I recommend to try it out, it's very cool
poor play
