Who sees my stupid mistake?

[RuudNL]

I set the config parameters in the programmer (as usual).
The values you mentioned are the defaults in my programmer, except the HS mode, that I set manually.
The point is that everything (almost) works.
If I create a loop that does nothing else than: serout2 xxx, delay 1000, I get MIDI information every second.
My main suspect is that the switch(es) are not read correctly in: if PORTB.x =1 then ...