A setting of 80-100 diffusion and 20 ambience will serve you for most purposes, but also be aware that ambience relates to the settings in the sky/atmosphere figures, there fore setting a white ambience value of 20 will make no difference at all if global ambience is set to black in the sky menu! It can indeed be a fickle balance with all the settings!

Adam Benton | www.kromekat.com