The M13 would need to send out discrete Midi program change messages. You can program multiple program changes to a channel on the Mod50 though.
For example, I have a Mod 50 based setup. and an M4, both using the same midi controller, FX setup. I haveModule 1, channel A on the Mod50 responding to PC 1, 3, 5, and likewise for the other channels. This allows me to not have separate patches for each setup. Makes life much easier.
Thanks for the replies. Doing a little research shows that the M13 will send program change information when it is in scene mode but if anyone has any first hand experience I would appreciate hearing about it.