I'll also be unhelpful and add that I considered making some for some buddies I have that are real big into it, but I also didn't have the desire to "guess and check" with them like I did with turkey calls. Same with elk yelpers. I also live 25 minutes away from where FoxPro is located so not really worth it for me to waste materials.
To attempt and be helpful I was looking through some pictures of the ones for sale by the bigger manufacturers and it seems that a lot of them are 2 reeds with an uncut top reed. I wasn't able to find any good pictures of the call from the underside but some of the calls have a larger portion of the top reed removed and you can see that it appears to be only one reed below the top reed.
If you go to the FoxPro website and look at their selection of diaphragm calls, by clicking on one of their 3 packs, you can select the "Overview" tab and they have some of their latex combinations listed, obviously no tension numbers but at least you can get a look at what type of latex's they're stacking.