Isn't DVC hardware volume control implemented in Poweramp Equalizer and the reason to disable absolute volume control in the developer settings of Android is so that the hardware volume control is controlled only in one place?
Just to be sure I understand it correctly: If DVC is working the volume control on my phone and my Bluetooth Headphones should be synchronized? Because currently the volumes are not synchronized.
When I try to enable DVC it constantly switches between "Not Available" and "Available" on my phone. I have disabled absolute volume in the developer settings.