This is a very early Media Network magazine documentary about broadcasting in Southern Africa, when apartheid South Africa had stations operating from the various "homelands". We had no internet, only cassettes - and the link to the late Frits Greveling who had presented and produced the previous DX show to this one, DX Juke Box. He returned to Johannesburg to work for several South African radio stations. Although the style is totally out of date, the information about broadcasting in Southern Africa in the early 1980's remains fascinating.
I note that there's a site dedicated to the memory of Capital 604 Transkei. You can find most of the jingles they used here.
You may also find the video interview with David Smith to be interesting. He also had adventures with Capital Radio which can be found here.