Thank you very much. I will look at that tomorrow. So far, when I set the disc in the sd mode, say at 70, targets up to 70 will be silent.
I must have a 2.1 chip, though, because I followed the procedure (holdig "enter", tapping left/right, which results in a return to led 9 (fixed) being lit, is there any way to check the chip version?
Thanks an sorry for the trouble.