iirc a TRC can be set without trigging a note, take the shortcut hint, adapt it or leave it; you can’t apply any p-locks across a whole track with any hidden mode - I’d like that ability to set track-wide probability too, but this is where we are - File a feature request
TRCs are a per step sequencer parameter - they can only be used if they’re actively locked in - there’s no default/baseline beyond off
PS - I don’t know the nuances of the DN seq where note entry and trigs are using the same buttons - things may be different to the analogs