Freestyle is kind of right. The Show Designer can handle 16 fixtures of 32 channels each BUT... groups of like fixtures can be defined within a single fixture as long as they don't exceed the 32 channel space. Thus the Show Designer can handle up to 128 fixtures of 4 channels each, etc. You could easily put all 8 of your Rainbows under the same "fixture" since they are only 2 channels each. Confused??? After you play with the Show Designer for a while, you won't be!