Using GPIO to change Subwoofer low pass frequency?

Is it possible to use rotary encoder, potentiometer, push buttons connected to GPIO pins to change low pass frequency or to cycle trough multiple EQ presets?

I would like to use amp v.4 to power a subwoofer and to be able to change sub frequency with rot. Encoder just like on sub amp. (Existing up2stream Sub Amp does not have inputs or ADC keys. )

ACP workbench documentation is missing this detailsā€¦

Any smart idea is welcome :grinning:

@zpl1025 Happy Year of the Tiger Frank :slightly_smiling_face:

Thanks, :slight_smile: Happy new year of tiger.