This was one of the first audio I discovered when I moved to Toronto in 1993. It was simplex, I was able to hear units when they were in the west end (I lived just north of the Bloor subway line in a basment in a valley near High Park)152.090 was the news assignment editor frequency for CFTO for many, many years, It's been a long time since I had it programmed into any radio, but I'm pretty certain it was simplex (no repeater) in the late 70s and early 80s. If you're hearing broadcast production audio on it I suspect they're using it as a link back to a live reporter location.
Yes I eventually figured out its just the audio part of CP 24. ThanksI had that in my radio, but everytime the radio scanned it would stop on it causing me to hit the scan button again and again. It's since been deleted from my radio, but it's good if you're away from your tv.