A control system (A-1000) for mixing materials (100) having a container (B-1100) to receive the materials (100), agitators (B-1300), a driveline (B-1200) to drive the agitators at an output speed with an output torque (Tout), an power source (C-1000) to provide an input speed with an input torque (Tin), a continuously variable transmission (A-1500) that connects the driveline and the power source, and an electronic control unit (A-1100) configured to adjust a speed ratio of the continuously variable transmission to provide a linear relationship between the input torque and the output torque with a slope (M), when the input torque is below a control input threshold (Tin_control), and to follow a corrected linear relationship between the input torque and the output torque with a corrected slope (Mc) smaller than the slope when the input torque is above the control input threshold.
