Thanks for your detailed description. Works now!
There is one more thing I would like to adjust. If I use the slider, volume increases rapidly. I would like to have this slower. During setup process, I’m asked to enter the IP address and the, I want to call it, intermitting step. I don’t remember how it was called exactly. I tied to set this to 0.5 doesn’t work. Then slider is not working at all. Is there a possibility to refine this?