(Ok, so as "mini" as far as we can get it with an actual transformer inside!) Our MiniDI is rocking a transformer from Unagi Magnetics, which is the house-brand from our friends over at SushiBoxFX!  This is the same transformer they use in the tube-based Finally DI and the Venus Z. The frequency response is the flattest we've seen out of multiple transformers, which makes this DI perfect for any instrument you throw at it. With a ~15db pad, phase-flip, and ground-lift at your fingertips, we've isolated all inputs/outputs/switches to one-face of the device so you can tuck it away against walls/under pedalboards, or even under a pedal like a riser.