This is something original and very cool! “True Iron” transformers emulation plugin from Kazrog. Gives some extra mojo to everything. I personally love it on the Drum Bus where it glues it all together like no compressor can and on the Mix Bus where it gives a bit of extra loudness when you need it and saturates the mix in a very pleasant way.
here what they say about it:
accurately emulates two classic line transformers, known for their use in many of the biggest names in vintage analog outboard sound processing. In USA mode, True Iron emulates the UTC 108 X, and in Euro mode, the Malotki 4001B.
These transformers add weight, heft, and girth to your mixes and masters. The plugin features adjustable strength, input impedance, wet/dry ratio, and a special “Crush” control to add fat transformer saturation to tracks and buses. Plus, the CPU usage of the plugin is low enough that you can add it to every track or bus in a mix for added virtual analog warmth across your entire mix.
Read more at http://kazrog.com/products/true-iron/