Hi
Now I have tried BenF’s firmware and I found it quite buggy 
Most of the time when changing time/div the waveform disappears and it doesn’t look like a drawing bug because the frequency counter changes to “freq” too. The freq popup shows --.- or something like that. And I can’t get rid of that reference waveform (may be a RTFM but it is just not logical anyway). But I’m very happy that the SING works now 
And the FIT function, yes it’s a separate button now but it still changes the mode in the top left corner??? Shouldn’t it be possible to use FIT after a SING trigger event has happend to adjust it on the screen?
Anyway thank you very much for your efforts and I really hope you will continue your work