Hi Proximo737. The reason why volume adjustment doesnt work via bluetooth is because the used version of PulseAudio doesnt support Flat Audio. With the latest version, it is supported. See the release notes: https://www.freedesktop.org/wiki/Software/…pabsolutevolume
I dont know when PA15 ends up in LibreElec. I hope quicklly.
If you had an Android device you could disable Bluetooth Absolute Volume in the Developer options, after which you can control volume again. but the proper fix is in Pa15.