Prime Go Plus Bluetooth Out?

When using bluetooth out on my Prime Go Plus the Main level out does nothing. I can only change the volume on the mixer or the channel gain or by turning the bluetooth speaker up.

In the instruction manual it says to use the Master/Main Level to adjust the output volume but no joy.

Everything works fine when using wired.

Anyone else have this issue or know what I have set wrong?

Thanks

Yes the manual is wrong. Once connected you need to use the slider in the blutooth menu to control the output volume.