MPC 2.15 - Midi Control - No CC List

I have a Nord drum 3p. I want the MPC to control the reverb send by mapping an external controller, to CC48

I have set up a midi track for the Nord

I go to midi control. I map my external mini controller using learn. All good.

The Target menu contains OFF and MIXER. Where is the list of MidiCC’s so I can select controller 48?