Hi @maximlequeux
OK, I’ll admit that is pretty weird, not to mention conclusive! Just to confirm, you are saying that you tried with a second Amp and saw the same behaviour as with the first?
That is confusing, as I just now downgraded my own Amp to S1, set it up, and I was immediately able to use the touch controls. So, this issue seems limited to your own system so far.
I’ll admit that it has me kind of stumped, however. I was going to suggest a Factory Reset of the Amp until I realised again that there are two Amps behaving the same way.
What I’d like to do now is see what the Amp says. Please adjust the volume using the touch controls on both of the Amps, one after another, then immediately submit a support diagnostic afterwards, letting me know here when you have done so, but please don’t share the number given.
Thanks!