I have a style that sounds 100 bpm when the keyboard is at 50 bpm. I am trying to figure out a simple way to fix this. How can I change all note values to be half their original value?

I tried using Style Time Editor 1.1 to change the time signature to 2/4 (original is 4/4). The trick seemed to work except that the Yamaha style playback doubles the tempo automatically when switching from a 4/4 style, which defeats the purpose of what I was trying to achieve.

Any ideas and tips are greatly appreciated.