Abstract: A control assembly for continuously dispensing material from a pressurizable hopper utilizing multiple control schemes. The multiple control schemes include a first phase for dispensing material from a pressurized hopper using a loss-in-weight feed control scheme and a second phase for dispensing material from a vented hopper using a volumetric feed rate control scheme. During the first phase a pressure valve coupled to the hopper is opened to pressurize the hopper and a fill valve and vent valve are closed. The controller receives feedback from one or more load cells to control a mass flow rate of material dispensed from the feed device during the first phase. During the second phase, the pressure valve is closed and the fill and vent valves are opened. The controller uses input from a feed rate or speed sensor to control a feed rate or speed of the feed device during the second phase.