No sobwoofer mode piano 2.1 after update to 2.502

I am new here and I have the sparky board with kali and Piano 2.1 - it works fine.
But I still have the same problem with the subwoofer output that don’t react with the volumecontrol of Volumio.
You solved this problem with the new release of Volumio-2.572 for the raspberry, wonderful.
So is it planned to do the same with the Volumio-software for the Sparky board?

This would be wonderful - thanks for your great work,

In the last version change the volume mixer from digital to master. It works for me.