V2 owner here. Usually using it via USB to connect to an iMac.
Got two major problems:
1. The device keeps turning on even though I have turned it off. I turned off Bluetooth connection on my iPhone, and iMac is in sleep mode, but DX3Pro still 'wakes up' after a brief sleep (several minutes) for no reason. It wakes up sometimes with BT and sometimes with USB mode (this time it was USB). Am I doing something wrong?? I've got a BT keyboard (HHKB) that miiiiight be affecting something but I have no strong reason to believe so. Other than that I don't use BT for anything. They sent me a new device but the problem still persists. Maybe I should turn the auto-power-on/off feature off, but I would like it to be automatic...
2. I cannot change the volume linearly (well, technically logarithmically) in BT mode from PC nor from mobiles. I
can change it, but the volume changes definitely not what I expect it to behave.
Here is a reference video:
how i expect volume to change from 0 to 1: 0 (mute), 0.1, 0.2, 0.3, 0.4, ..., 0.9, 1
how it behaves: 0, 0.1, 1, 1, 1, 1, .... ,1, 1
This did not happen with the first product (I did not check but I think it was probably V2 because it lacked pure DAC mode).