Sigma Studio - how to add Readbacks?

Hi there

simple question - where do i find the Readback blocks in Sigma Studio? I want to view the value of ADC inputs but I cannot find Readback blocks anywhere in the left hand menu tree?

I am using Sure (Wondom) ADAU1701 DSP

thanks in advance

JVN

Audio Signal Processors

adc

SigmaDSP Audio Processors

adau1701

readback