Just got back! You CAN have both the blobs and criss-cross bumps if you want. I was just getting you to see for yourself how you can create just the blob bumps. NOW... Here's what you do to adjust the height/severity of the bumps for each particular element you want to control. Open the .psd doc. The less contrasty you make the criss-cross or blobs, the less severe. And, just the opposite, the MORE contrasty, the MORE severe in your renders. Soooo... If you want it to be mostly BLOBS while still seeing criss-cross, click on the blobs layer, Edit>Adjustments>Brightness/Contrast. Make that puppy more contrasty! Click on the criss-cross layer, do the saem, but make it LESS contrasty. Flatten all, and save as your new bump map. "Ambient Channel"? Don't remember that one in Bryce. There's the Diffuse (or Color - can't remember which it is called in Bryce right now), and then the Bump map, and then an Alpha map that you're not gonna use for this kind of texture. Go to town!