Abstract: Aspects of the present disclosure include devices, systems, methods, and control systems for processing a feedstock into an output product having variable preselected characteristics. Various system components may include: 1) a feeder configured to convey the feedstock; 2) a mechanical pulverizer configured to pulverize the feedstock received by the feeder into pulverized feedstock; and 3) an air conveyor for conveying an air flow into the mechanical pulverizer and to draw the air flow from the mechanical pulverizer to a fines separator. The pulverized feedstock includes one or more of heavy fines, particulates, moisture, or combinations thereof. The air flow from the mechanical pulverizer includes at least a portion of the pulverized feedstock, wherein the portion of the pulverized feedstock is conveyed by the air flow.