From various sources, here is what I have found out:
"WHJB/Z107 was a comparatively well-equipped small station into which a fair amount of cash had been poured, (tower re-location, mall studio, decent staff-size & quality ... and mostly-decent equipment)."
"The system consisted of four six-foot tall racks. Two held two large reel-to-reel players each . The other two housed four broadcast cartridge playback machines, (Carts). The reels were full of music. One of the carts played the 'announcer'. The other three were positioned behind programmable carousels that held 24 carts each. They could rotate and be programmed to load the carts in a particular order or at a particular time, like the 'brain' thing we talked about before. Of these three, two held commercials and promos. The other held program elemens, (ID's, weather, breakers). Each piece of recording equipment-- from reels to cart machines-- was equipped with a button that would record that 20-hertz tone onto tape. It's too low for people to hear... but the relays can detect it. When they do, they open or close to activate the next machine."
Geoff goes on to relate that "there was a time when we made automation sound about as live as automation can sound. In late '88, Z107 reverted to automation from all-live... but retained it's 'hot hits' format. Those of us that were left would pre-record twenty-or-so announcer segues that would play between music and commercials. If there were enough of them that they didn't repeat... the place sounded like it was live. Hopefully, if you were listening at the time... you never noticed."
"WOKU/KROCK/Z107 has always been at least partly-automated. The only exception was a short period around '88 when it was all live, even mid-to-5am. As far as I know, I was only the second person to work live on that station. In '84, I replaced a guy named Rod Sinclair who had started doing 'live-assist'-- a live operator controlling FREDDIE during morning drive At the time, WOKU was programmed by an automation company called, Drake-Chenault. They supplied the reels of music and therefore, established the format. It was generic adult contemporary hits. Into this bland mix came Norm Slemenda as general manager. Like him and me, Chris DeCarlo was a WYDD alumni. She had left WDVE and had recently appeared in a Playboy spread on 'women in radio'. He gave her a three hour slot on Sunday night to do a heavy-metal show called 'Metalmorphasis'. "It's 11:00 at WOKU. That was Olivia-Newton John. Now here's Poison." Jan.1, '87, wimpy WOKU became K-Rock-- 24-hour metal... automated except for pm-drive with Chris and occasionally, me. The station billed something like $1,200 in Jan., $3,000 in February and $400.00 in March. By April, it was simulcasting the satelite-country format of am-sister station WHJB. K-Rock was cutting edge n'stuff... The problem was that hardly any businesses would pay to reach a heavy-metal audience... no matter how big it was. DeCesare-Engler bought a good bit. So did Tela-Ropa. Other than that, there were a few tattoo parlors and normal businesses that didn't realize what they were doing."