external interface with sigmaDSP
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: http://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.
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
Here is an example with 2 controls for a 3-way crossover.
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