OK, I purchased this and it works fine for this application

I want to use the Ifi nano iDsd Black label Portable dac and headphone amplifier from my Samsung galaxy S6 android 7 phone using an OTG cable. In addition to playing music, I also want to Play audible books, using their app. Will this work? This works for me using my desktop centrance...

dpipple - To change the range of the volume pot, a simpler solution is to install some padding resistors before the volume pot. 50 Or 100 kohm Should do the trick.