I've been looking around here for about an hour and couldn't find much information about DACs. I just got the Fiio Q1 MKII and hooked it up with my Nexus 6p via otg cable. tried to play around with the audio output section and nothing seems to work. The audio keeps coming from the phones speakers instead the the usb. I tested my DAC with another app and it worked fine. Has this feature not been implemented yet? OpenSL ES output seems to be the only thing i can get active. i couldn't get OpenSL ES HD to be active. ill keep looking around and see if i can find out what's wrong. I'm sorry if this has been discussed before. If it has please point me towards the discussion.