Just a thought on this - I have no experience of Windows phones - but I have just bought a Windows 8 tablet ( 8" Toshiba Encore ) and although there are some things I don't like about the way it works ( software mainly ), it's amazing what this is capable of considering the size. It runs Windows 8.1, 32 bit and does it a lot better than my old netbook ever used to ! I am wondering how long it will be before someone brings out a phone that runs full windows. Of course the tablet will work with any of my dacs/soundcards with no problems.
Mustn't forget this is an Android thread though, so back to my Moto G which deigns to work with 2 dacs and my Samsung tab which works with another ( but not the other 2 ) !