Hi SOAD,

I will have to do some investigating into Bubble and JRiver to answer you properly on these.

We do not have any V1 software for the Pi 3B+ so I would stick with the Pi3.

Interesting on the Volume difference with Bluetooth. I have not found that myself. Perhaps some others can let us know what they experience. It is always worth a reboot of your AxiomAir to see if that helps.

Ian Colquhoun
President & Chief Engineer