Reply To: Midi for LIGHT SHOW – controlling sync lighting for songs?? HELP!

Wouldn’t having the program changes and light FX changes in one midi file cause issues to either unit receiving midi?

No, but you would want each device on its own midi channel.
The only issue is daisy chaining multiple midi devices as the signal becomes degraded. If sending out to more than a couple devices, you would want a midi thru splitter like the Midi Solutions Quadra Thru.