Um...I'll take a crack at it even though I am a Bryce Newbie. I think you want to make another very similar terrain but instead of the height areas (the keys) being boxy, they should be slightly rounded, spherical, then put that terrain on top of this one upside down and make it a negative boolean and the original a positive then group them. That would be the quickish way I think. -Darth_Logice