I'm trying to understand how my doorbell and chime are hooked up so that I can upgrade to a video doorbell. It seems to be an older chime that a previous owner installed because my house is only 20 years old and the chime seems much older. I don't know the manufacturer, but the chime plays a song with 4 tones and has 5 connections, which are labeled C, R, F, S, and T.
I've attached a picture of the chime, along with the diagram of the wiring coming from the chime, transformer, and doorbell. Is there someone who can help me connect the dots (or wires) in my diagram to understand how the components are all connected (and if they seem to be connected correctly)?