This paper proposes a novel and simple adaptive control algorithm for the effective delay control and resource utilization of EMcast when the traffic load becomes heavy in the multi-group network with real-time flows constrained by the (\signma, \rho,) regulators. The control algorithm is implemented at the overlay networks, and provides more regulations through a novel (\sigma, \rho, \lambda) regulator at each group end host who suffers from heavy input traffic. To our knowledge, it is the first work to incorporate the traffic regulator into the end host multicast to control the heavy traffic output.