Rotery encoder with justboom amp zero en pi zero not working

Hello,

For my new project on the ammocanbox I want to use a rotery encoder.
I followd these steps:

Rotary Encoder is now compatible with JustBoom sound cards

And used this rotery encoder:
https://www.tinytronics.nl/shop/nl/componenten/overige/rotary-encoder-ec11-20mm?search=encoder
I’am sertain that the encoder is working. I tried it with this post:

Rotary volume control for the Raspberry Pi

The only problem I have with the post above is that the volume is only going up by 2% and directly going down with 2%.
But I can see there is a input by the encoder.

If I use it in the set-up like the jusboom post nothing is happening. The rotery encoder software is running and I used the given gipo pins.
I also put in the advanced settings of the player the next line: -o hw:CARD=sndrpijustboomd -V Digital -Q
The alsa mixer is working. If change the volume in ipeng i see the change on the alsa mixer.

Can someone confirm the rotery encoder is working on the Justboom zero amp?