Thank you, this solved the direct Bluetooth connection in between my Hiby R6 and my BT Final ZE3000.
My issue remains if i want to use my Bluetooth USB-C DAC (aptx adaptive receiver) to get use of Aptx Adaptive of my ZE3000 (since Hiby R6 is not aptx Adaptive compatible per se).
I did some test, connected the usb dac to my Hiby R6 with the IEM paired to the DAC in aptx adaptive:
1) in PA if USB DAC is ON under HiRes, no sound get streamed, no matter if i switch NO DVC ON or OFF. I also tried to rise volume trough PA and also directly from my IEM (which bips, thus increasing the volume) but no sound it’s streamed. Also tried to disable Absolute Volume from developer but no sound get streamed.
2) in PA if USB DAC is ON under AAudio Output instead, if NO DVC is OFF, no sound is streamed, no matter if i rise volume on PA or by my IEM.
if NO DVC is ON, sounds get streamed (can change bitrate, cannot change kbps which remains fixed to 48khz) but i can control the volume only via touch buttons directly on my IEM (visually also showing increase of +-1 in Poweramp volume UI wheel). If i try to change volume from PA UI volume wheel, the volume does not change. How can i sync PA volume with the IEM volume via USB DAC?
note: i tried the USBC DAC with Hiby player, and it works flawlessly, no config needed.
Anyhow, for the test above with PA, Hiby player was disabled and forced stopped from Android to avoid conflicts.
thank you