This has nothing to do with the volume control! I have this hiss with every other application too! The audio path from the M11produces audible hiss with high sensitive headphones. On my Beyerdynamic DT1770 i hear nothing over the 3.5 jack. With my ibasso IT04 on the 2.5 jack i hear this hiss very good.I don't have roon so this answer may or may not help... some apps have their own volume control... if roon does then you should turn the roon volume control down and try to match the output volume of the Fiio music app or UAPP... hope this helps..
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