Oops, I just noticed that I made a mistake. In the initial post I mentioned DAC - Digital to Analog Conversion. That is WRONG. It should be ADC - Analog to Digital Conversion. I made the same stupid mistake in the 2nd video maybe the 1st but I have not checked.
I certainly did not expect "Tool of the week" with this. I thought that it was too far out of the main stream for that. Many thanks, it is very encouraging.