It is a rather complicated setup. I have 4 midi devices, amp1, fm3, ml5 and amp selector that I want to link together so I can with press of a button switch between 5 different setups. The amp selector can only be at the end of the midi chain as it has an input only. The Amp1 can be either only the first or only the last midi device in the chain. The Amp1 with the Remote1 connected to it has a midi out port. The Amp1 without the Remote1 connected can use the Remote1 port as midi in port with a dongle that I own as well. The ML5 and FM3 both have midi in and midi out but the ML5 is not smart and can't send extra commands downstream like the FM3.
My current midi setup is Remote1 -> FM3 -> ML5 -> amp selector. The Remote1 can only send PC messages on midi channel 2 sequentially equal to the 9 buttons on it. It does have 4 banks, so I can access the first 36 presets on the FM3.
When I press on the first 4 buttons on the Remote1, it selects the channel, turns on the effects loop and/or the boost pedal on the Amp1. The FM3 listens on midi channel 2 and selects the pedalboard preset on the first scene which has a midi block that tells the ML5 to turn on loops A, B and E. The ML5 has 5 loops. A is the input and send of the FM3, B is the input and send of Amp1 and E is the return and out of the FM3 and lastly the Amp selector to switch to the channel that the Amp1 is on. The output of the ML5 goes to the return of the Amp1.
The first 4 buttons give me the Amp1 in 4 cable method with the FM3 as the effect processor and access to all four of its channels, clean, vintage, classic and modern.
The fifth button will switch again select the pedalboard preset on the second scene which tells the ML5 to turn on loops A, C and E. Loop C has the Atomic Ampli-firebox in the loop instead of Amp1. Again here the FM3 is an effects processor
The sixth button uses scene 3 on the pedalboard preset to swap loop C for loop D which is my Simplifier Deluxe pedal.
The remaining 3 buttons are to my favorite presets on the FM3 and turns on just the A and E loops, so that the FM3 is going straight into the return on Amp1 and into my cabinet.
The amp selector switches between the Amp1 and my Marshall JVM1 into one cabinet.
What this gets me is one button select between any of these setups. I can compare my FM3 with my tube amp or the Amp1 or the firebox. It also means that I can with one press be playing any of these setups without re-cabling or dancing on a bunch a/b switches.
The only part of this setup that wasn't working was when I wanted to venture away from my 3 favorite presets on the FM3 and go to another preset.
What I am trying now is laying out the first nine presets on my FM3 to do all this and leave PC mapping off and seeing if I can use the FM3 FC buttons to navigate to other presets on the FM3.
If that doesn't work, I can change the routing so I remove the Remote1 and the FM3 becomes the first in the midi chain and I connect the Amp1 to the end of the midi chain. If I am stuck doing it this way I will loose the ability to switch amps on the amp selector via midi as it will no longer be in the midi chain. I can do it manually, so it adds an additional step.