Okay, understood. We don't do RPN directly, and I don't know the MIDI spec well enough offhand to know if you can do it with NRPN and/or with two CCs. If you need multiple MIDI messages, you can do them in MIDI Designer, too. This will be the first use-case of RPN that anyone's actually talked to us about. Let me know what you discover and we'll see what's missing in MDP, please.
Thanks!