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How to control advanced processing parameters with GPIO?

Question asked by ssanchez on Sep 2, 2010

I know that there are simple prebuilt blocks for controlling volume using a couple of digital GPIs (up/down pushbuttons), for example.

But how can I control other parameters of more complex processing blocks in an end-system not having an external microcontroller or connection to SigmaStudio, but using only GPIO (pushbuttons, encoders and potentiometers)?

As a simple example, I would like to know how to implement a crossover filter and be able to vary its cutoff frequency using an encoder, two buttons or an auxiliary analog input, if possible at all.