oh I thought that by "the second" you meant
bela_robert try running the language-overview PD example – when you open the scope you should see four different test signals visualised there.
What I can guess from your patch is that something is not good with the analog electronic frontend to your pepper. Just to confirm the scope is working fine first, please try the language-overview
example. If that is fine, then you could try scoping all analog input channels (4 at a time) and check if you get signal on any of them