Ultra ++ Setting input

I have an ultra+ streaming with a pi zero to an icecast server.
I need to set the input to external mics via the mic input with bias enabled, and have control over the gain.
At the moment all I have is noise in the L channel.
Are there ‘use scripts’ as with the old Wolfson card? or another way?
I’d be grateful if somebody could describe the process or point me to instructions…
Thank you

please check that topic : Microphone bias features ULTRA++