Pg 60 in the manual.
None of these have specific CC numbers assigned to them, but you can assign any parameter (channel volume, output block level, IR level, Drive, Sag) to be toggled from a minimum to a maximum value within the Stomp itself and assign that control do whatever available MIDI CC you'd like.
For Preset Up/Down, those commands are in fact in the Command Center under HX Preset. I don't think you can access those commands via MIDI unless you assign them to the Stomp switches and then use the corresponding MIDI CC to emulate that footswitch.