The ECM-519 is a superb feedback fet compressor, with all the bells and whistles and then some. I’ve commonly used it just for the transformer selections for saturating digital audio material that needed some character. It’s stellar at adding snaps to drums, and the auto-modes work like a charm on finger picked acoustic guitar. And if I ever feel I’ve gone over the edge, the mix knob is there to bring me back to reality. It’s easy to see why it’s nick-named the Empressor!