In 50+ years of hunting deer in La., Ark., Miss., Al., and Tx. ... I have never once heard a "buck roar".
I have tried grunt calls, doe bleats, etc. with what I'd describe as minimal succss. The few bucks that did respond were nicer ones. But frankly, I have had dozens and dozens of bucks from spikes to very nice racked ones not pay one iota of attention the my efforts.