@intrglctcrevfnk and
@Gibs210 and @rsmith601 a graphic representation of the envelopes like the filters shown in post #471 would be a huge help in understanding what the intended functions of the envelopes are over the numbers on a .... Hate being a squeaky wheel on this but apparently I am not the only user wishing for a better understanding of the intended functions on the C4 because I have not sussed them out by investigation and the information provided I personally do not find helpful but rather confounding.
When I mentioned a graphic representation of the Envelopes before I got some double talk about expense as if I had suggested you go to JPL or MIT for research program or some such. I would think that during the design process there were notes, perhaps even drawings of the envelopes to decide which 11 would make the final cut, hmm.