Okay i wanted recommendations and how-to's about several stuff. Here- - I make music and have recently bought Beyerdynamic DT770 pro 250 ohm headphones. I'm considering to buy Schiit magni 3 as amp. I'm also going to buy an interface (2i2/2i4/ur22). And, I'm thinking of not buying an external DAC. Will this setup help me make use of maximum potential of my headphones? What do you recommend? -Out of Focusrite scarlett 2i2, 2i4, and steinberg ur22, which one is the best? (keeping in mind all general viewpoints) -Will I be able to connect a USB MIDI instrument to an interface? Is it necessary? Any help will be appreciated. Also,I'm sorry English isn't my first language. So please let me know there is something not understandable in the paragraph.