Hello,
If you have a trackpad, APP exposé is the solution! In Lion/ Mountain Lion you enable it this way:
System preferences/ Trackpad/ More gestures/ App Exposé (whipe down with three fingers.
It is the same as exposé, but only the open windows of the app that has focus. Works incredible well with Cubase!
I am coming from windows and I think this way of working is even superior to “the mouse”. Working on a Macbook pro and when I buy an Imac (one day…): no mouse, TRACKPAD!
Hugo