I'm fortunate that I have my own office so don't need to worry about headphones during the working day - just have multiple speakers. How do these extraordinary headphones cope with sources from a TV, computer, laptop, phone, and test kit, which I want at different levels and outputs?

A £50 mixer takes these inputs (almost all from 3.5mm sources) and brings them all together via a reliable tactile interface.

On the road of course I only tend to have to choose between 2 sources, so perhaps beats can approach the utility of a 3.5mm audio cable.