George and AJ,
I have version 4.0 oriental installed in my store unit and nothing happens when I turn on the manual bass button. One thing that is cool that I didn't know was that when I tap the to lowest button it now works as a tap tempo button. I never knew this before. You can tap it 2 times and the style will start, but if you have the sync start light on, you can tap as many times as you like and then start it by playing a chord on the keyboard. How long has this feature been on (version 3 or version 4). AJ, George is probably using the 4.0 oriental as well and maybe the 4.0 on the regular X1 works differently. Try the oriental version and see what happens.
George Kaye
Kaye's Music Scene
Reseda, California