@tomik For changing the sample rate you have to do the following steps:
1) Change your sigma studio file for the new sample rate
2) Recompile your plugin with sigma2aurora.py
3) Change the value sampleRate in plugin.cpp
4) Reconfigure the DAC for the new sample rate in AK4458.cpp
5) Recompile the ESP32 firmware with ArduinoIDE and upload it.
I know it would be better that you can change the sample rate inside the GUI, this will be a good feature for a coming release.
@NoOnes2 I did not look at your file but basically you have to copy the RCA input section from AddOn-B including the 220K termination. Replace the DIP switches by a wire. For ouput let the cold output floating. Don't connect it to ground because it will make the the output section clipping then.
Raphael