You answered the question by yourself 
Here it is described in detail
I’ve started looking to this post : Send a MIDI message out when song part changes
Song Part Properties, here you an compose multiple Message to be sent, not only PC messages
You answered the question by yourself
Here it is described in detail
I’ve started looking to this post : Send a MIDI message out when song part changes
Song Part Properties, here you an compose multiple Message to be sent, not only PC messages