Hee awesome mod creator!
I may have found a bug whilst playing with angels smelting mod.
My ore processing machine does not accept the input it receives. i also found that all units produced in the angels smelting mod don't show up in the "metallurgy" category in the signal GUI but in the "unsorted" category, although i don't know if those two problems are connected.
i have provided some images to make my problem more clear and put them in this imgur link:
http://imgur.com/a/Ki4gP
With further testing, this time with the blast furnace, i found that i can't select a different recipe for the same unit, in this case iron ingot.
At first you can only make iron ingot from iron ore, but with later research you can also use processed iron to make iron ingots. I can't differentiate between the two recipes in the signal GUI, And the available signal "iron ingots" does not get accepted by the blast furnace