 The study of cavity magnant polaritons, CMPs, in a magnetic sample placed in a microwave resonator reveals that in a strong coupling regime, there is coherent exchange of information between CMPs and can be used for future applications such as information processing. A two-port driven CMP is employed to control the coupling strength by the relative phase phi and amplitude field ratio underscore zero between both ports. A new expression from input-output theory is derived, and the implications on the coupling strength are discussed. The study also examines intermediate cases where the relative phase is tuned between its maximal and minimal value and explores the high underscore zero regime which has not been previously explored. This article was authored by Isabella Boventa, Mathias Clowey, Graham Osado, and others.