MCU Pro and XT in cop-operation mode - nothing being written to XT LCD

Started by Don Stewart, May 16, 2026, 01:55:24 PM

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Don Stewart

Hi Alexei
I know most people are not using AZCTrl with Mackie MCU but I still prefer it because of how I have configured it.  Recently I added an MCU XT to my setup and modified my plugin using the "co-operation mode" (Master-slave).  Everything is working fine except I cant write to the XT LCD Screen.  I'm pretty sure this is due to the fact that you are not sending the correct device ID for the XT to accept screen updates with the LC/MC/C4 LCD command
Here's an example of MCU LCD update sysex:
F0-00-00-66-14-12-54-72-61-63-6b-20-31-F7
for  XT this needs to become:
F0-00-00-66-15-12-54-72-61-63-6b-20-31-F7
Any chance you could fix this small issue ? I would really like to keep using AZCtrl/
thanks
Don

azslow3

Hi Don,

please check that in MCU XT preset you initiate communication with XT, not MCU.
So check that "Prod. spec. send" "LC/MC/C4 Hello" Action has "MCU XT" parameter set.
This parameter should control all following SysExes ("MCU" = 14, "MCU XT" = 15).

I don't claim there is no bug, it can happened I mess something in co-operation mode. But as safety responsible at my mothers work was always saying (~60 years ago...): "before starting to fight with the fire... check there is a fire..." ;)

Don Stewart

Thanks Alexei
I thought I had checked that but I will double cheeck tomorrow and let you know.  Its totally possible I missed it