Raspberry Pi 3+ and a PIFI DAC card Problem

I have a raspberry Pi 3+ and a PIFI DAC card
volumio version 2.632 everything worked fine!
everything was available under audio output
I used the setting:
type of mixer: hardware
type of mixer-control: digital

from version 2.779

no setting possible:
type of mixer: software or none
type of mixer-regulator: not available

does anyone have an idea why there are problems with the new versions of volumio? :frowning: