The main Radio Roles site can be found by clicking this link. There you will find a description of the original Radio Programming Roles. It also contains links to many downloadable documents including the iconic RICEFields Journal
It should be noted that more recent publications can be found as follows:
The Gray Matrix – https://thegraymatrix.org
On ISSUU you will find older publications at – https://issuu.com/frankgray These include The Fourteen Roles of Radio, The Gray Matrix, Dimensions of Our Message, Incarnational Radio and Finding Answers