No knocked it out in about 15 minutes. It's easy to look at my drawing and follow it but you need to understand something about signal distribution to mix and combine them right to get the proper end result. Each channel has a visual and aural carrier. There can be problems with adjacent channel interference and harmonics if specific parts of the 6mhz bandwidth per channel isn't shaped right. You guys need to learn on your own since it would take way too long to try to explain it and taylor results to each individual case.
I learned by the hard school of knocks. Hands on experience is the best teacher.