external interface with sigmaDSP

Hi mong,

I'm not sure what you're asking. Can you please re-phrase your question?

There is Potentiometer Control the frequency crossover 2 WAY

I use IC number ADAU1701

Only cells that have an index input can be used with external control GPIO. I wrote an application note on this topic. Please read it here: https://www.analog.com/static/imported-files/application_notes/AN-951.pdf

Here's an example of using index selectable filters as a basic aux ADC controlled crossover.

ez.analog.com/.../958f15064c2cd2dd81c752ded865c319.html

ez.analog.com/.../90e5b0a7cd960566e8b2e735af5a46e2.html

ez.analog.com/.../ce14a9ee79de0f29abe48d5a51bd2c42.html

Here is an example with 2 controls for a 3-way crossover.