Hey Phil -

Simply click on the NUMBER of any measure. You will get a part marker "a". Click it again, and that will change to "b" - defining a different style.

Right-click a part marker and you will see the drum styles applied - and can change them if you want.

With some styles, clicking a 3rd time will give you a "c" part marker, then "d", etc.

If there is no "c" style, it will return to no part marker.

floyd