Keep volume control active work mixer type 'None'. Amp volume control with IR

I have an amplifier that i can now control using IR through usb connected Arduino to RPi. However the Volume control functionality of Volumio is hidden when I select mixer type None.

I did some edits in alsa_controller/index.js and volume control.js, but it is not working consistently. If I select Software mixer I get both volume control on the amp and Volumio which is. It acceptable.

Suggestions to keep volume control active but keeping the lossless Audio signal of using mixer: None?

I use the experimental plugin Volume_guard by @MichaelE it sniff on push events and check for volume change commands.

Credits to him.