Talking out my ass, but would this have started in the late-70s, around 78 or 79? It seems like Kalehoff liked to do a lot of synthesized arrangements (case in point, Trivia Trap), and some of Goodson's late-70s music seemed to be more live instrumentation instead of synthesized (i.e. Mindreaders, Password Plus, TTTT80).
Again, all speculation, and I'm prolly way off.