Here we go, this is roughly the settings I had on the tree in the following picture. Don't laugh, the picture was one of my first Bryce attempts back in Oct '03 and I was dead proud of it at the time. But I'd put on some complex metal mats (it was inspired by a metal willow sculpture I'd seen) and I didn't realise it was going to take forever to render so I ended up reducing the leaves on that significantly, hence it's rather bald state. These are after I've tweaked it upwards again to a more normal tree.