how they can interact with the console hog pc and midi?
besides your widgets, there are other systems for expand with the faders "hog pc"??[\quote]
You can use Midi Show Control to fire cue lists (and other functions using Comment Macros in those cuelists).
You can use Midi Notes to press almost any button on the console.
You can use Midi Notes to fire cue lists.
There is no mappings of faders from Midi.
The only external hardware that connects to Hog3PC for Faders and/or DMX output are the High End widgets and wings.
Take a look at the 3.1.7 release notes for the Midi implementation.