This is working well with Volume Control disabled.
I've been comparing audio tracks on it as well as on a Pono Player and with a Geek Out 1000 connected to my Macbook Pro. The latter two have more power, but I've tried to see the volume output to be the same as what I am hearing through the Durio and the Durio is sounding really good.
I am using a pair of HifiMan HE-400s for all tests