A method of controlling an upstream and a downstream process wherein the upstream process conditions a stream of product delivered to the downstream process is provided. The control method uses an empirically determined formula to determine a metric for adjusting the activity of the upstream process to thereby adjust the rate with which the upstream process conditions and feeds a stream of conditioned product to the downstream process. The empirically determined formula determines the metric using two input variables: a duty cycle setting of the upstream process and an output rate of the downstream process expressed as a decimal amount of the output rate set-point.