Epic fail. Thanks for the reply! Sounds like that would be an awesome way to go if I can find someone to do help with the upgrade!
@ClieOS would you happen to know (perhaps in passing, from Fiio guys) if the X3 1st gen has a dual rail supply? Or just a single rail supply?
Still looking for other chips that might work.
It has been awhile since I measured it, but IIRC, it is dual rail +/-5V.
p/s: Found it, here it is: