Anybody else using USB-OTG digital audio out?

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http://forums.androidcentral.com – Galaxy S4 -> USB OTG cable -> Fiio E17 headphone amp/DAC -> self modded Fostex T50rp headphones. I'm not sure how many people on here care about high quality audio, or know about USB OTG, or know of this phones ability to output digital audio. Anyway, this is possible on this phone along with certain digital to analog converters, with my Fiio E17 being one of them. From what I have been reading, this does not seem to work for all DAC's out there. For those that do not know anything about this, this all means that you can bypass the phones internal DAC and use a hig (HowTos)