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The buttons that follow control the strength of various Breeder Type settings of sands. In the Fourth tab (Sand definitions), sands have a parameter called “C/AC Breeder Type”. The strength of these special properties is altered here.
AMT controls the amount of creeper to remove (in case of Absorber) or spawn (in case of others) per game frame (a second is 30 frames). MAX will not add more creeper if the amount on top already exceeds this maximum. ON/OFF declare the duty cycle of the action, for example by default breeder is enabled for 45 frames then disabled for 90 frames and repeat.