Recently I've purchased a number of PBR materials as I loved the look they had. Each set has an ambient occlusion, base color, height, normal and roughness map. Through trial and error I somewhat figured how to use them, yet I can't replicate the same look from the vendor examples.

It is a limitation of the Poser engine? or I am doing this wrong? I'm currently doing this

Ambient occlusion > diffuse value and specular value

Base color > diffuse color

Height > displacement

Normal > gradient bump

Roughness > bump