Hello! I have a problem with my AP60. I have xDuoo XD-05 and I want connect my AP60 as USB transport to them. But I have a big problem. the sound output from the XD-05 is very quiet. The volume is set at maximum on AP60, and on XD-05. For comparison, a bunch Shanling M1 and XD-05 is working correctly, the sound is excellent and adjustable. OTG adapter checked, he's fine, through it works great with smartphone, and with M1 that are connected via an additional adapter micro USB to Type C. On AP60 installed the firmware 1.02 b, in settings exposed to USB mode. Help me, АР60 I like more than M1, ergonomically it fits me much more and it's the one I want to use as transport for XD-05.