Kernmac
1000+ Head-Fier
USB-DAC
I plugged the Jr into a Windows 10 based PC. Selected DAC option on Jr and right clicked on sound icon to ensure IRiver device was recognised. No problem, however also no sound. Repeated the steps however this time I used the PCs USB 2 slot (not USB3) and presto, DAP operates as decent DAC. I don't know if this is your problem, but give it a try. For the record my Jr charges and files can be dragged and dropped using the USB3 slot, however it seems that to operate as a DAC USB 3 doesn't work and USB 2 does.
I plugged the Jr into a Windows 10 based PC. Selected DAC option on Jr and right clicked on sound icon to ensure IRiver device was recognised. No problem, however also no sound. Repeated the steps however this time I used the PCs USB 2 slot (not USB3) and presto, DAP operates as decent DAC. I don't know if this is your problem, but give it a try. For the record my Jr charges and files can be dragged and dropped using the USB3 slot, however it seems that to operate as a DAC USB 3 doesn't work and USB 2 does.