Garageband MIDI CC mappings?

[Ghillermo]

Hi! I know this is beyond this project, but maybe someone can point me to some list or data about which CC inputs Garageband uses? I'm trying to build a controller with a few knobs or faders for Garageband on iOS but I can't find a CC list anywhere. Which parameters can be accesed via CC and what CC messages am I supposed to send?