Maybe my question at the end wasn't that precise, what I wanted to ask:
Is the "Midi CC RX" just for the assignable A-H CC controllers and independent of NRPN (Global -> Panel -> RXMODE on) or do I need both enabled? Because afair I had MIDI CC RX off in the past.
Anyway it doesn't change anything, also a soft reset did not help. Now filters don't change via NRPN anymore at all. Guess time to open it up