Control Hifiberry DAC+ ADC Pro without ALSA / Amixer on Elk Audio OS

I'm using a Hifiberry DAC+ ADC Pro on a Raspberry 4 while running Elk Audio OS. It works like a charme in general. However I would like to change some of the soundcards parameters eg. Enables/disables microphone bias voltage or the input gain. 

Hifiberry's data sheet suggests to make use of amixer commands. On Elk Audio this does not work since the card is not listed in ALSA. 

Now, I wonder how I can change those parameters instead? Any suggestions? 

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