In the Connector Settings wich Midi Ports have you selected ?

Page 47 user manual UFX lll :
These ports can be accessed under the name UFX III MADI Optical and UFX III MADI coaxial or UFX III MIDI Port 3 and 4.

The Midi ports you have to select in the Connector settings therefore shall be : UFX III MADI Optical (input and output)

Thanks Waedi and Ramses for your quick answers. Very efficient and reliable.
So I downloaded the 1.97 beta version of TM with the possibilitiy to include the 12 mic : awesome ! Matthias Carstens is really a master and very caring about his passionnate and professionnal customers.

So I tested the 12 mic and TM. It is to be noted that the gain changes onto the TM main computer screen are directly mirrored on the little 12mic screen but not the reverse : if you change the gain on the unit itself it does not come mirrored on TM.

The main issue though is that only the first 8 mic preamps work like a charm. The others are not recognized. Plus when I go to Options, then SETTINGS, it doesn't matter what I set in there, it is not taken into account, it keeps coming back the ADAT ports. But still the first eight MADI preamps work like a charm.
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Well to sum up this night : I am very happy to have sent my first message and very happy to receive nice feedback and help, thanks again. I confess the 12 mic is little bit confusing for me this is my first MADI experience.

So new questions : do you have any idea how to tackle the "SETTINGS" situation ? Does it come from my setup ? And how to tackle the 9-12 extra 4 preamps within TM ?

Thousand thanks !

Take another look at the screenshots, that's why I made them for you.

My channel distribution on the MADI BUS, related to the screenshots above...
ch 01..08 = Octamic XTC
ch 09..16 = 12Mic Port 1-8
ch 17..20 = 12Mic Port 9-12

Assumed now channels 1..12 for your 12Mic., see below.
It depends on how you have configured the routing on the 12Mic regarding its mic channels from/to MADI Bus (ch 1..64).

General info: since the device no longer corresponds to the 8-port scheme of the Octamic XTC, RME had to come up with something new. The idea here is to enter the 12Mic in groups of 4 ports to support Mic preamps with 4, 8 and 12 Ports.

12Mic Port 1-4:   MADI channel 1..4
12Mic Port 5-8:   MADI channel 5..8
12Mic Port 9-12: MADI channel 9..12

This is what you have to configure now under TM FX -> Options -> Settings (F3), Tab “Aux. Device” tab

Select the Channels (Bank, 8 ports) and enter the ports of your 12Mic under Device 1 and Device 2 in groups of 4.
Device ID, this is the MADI ID of your device, most likely 1 if you have 1 device.
Set MIDI In and Out to UFX III Midi Port 3 (this is MADI optical).

Channels "MADI 1-8":
   Device Type: 12Mic 1-4, Device ID: 1, MIDI In + Out: UFX III Midi Port 3
   Device Type: 12Mic 5-8, Device ID: 1, MIDI In + Out: UFX III Midi Port 3
Channels "MADI 9-16":
   Device Type: 12Mic 9-12, Device ID: 1, MIDI In + Out: UFX III Midi Port 3
   Device Type: None

Hello, I have read / followed the information / steps in the forum about setting up 12Mic to UFX III Midi over MADI, but in the settings page under Aux Devices, under Device 1 I get this message: "No Response" ? and I cannot control the 12Mic in TotalMix.

I have verified that the 12Mic clock is MADI Optical, everything is solid green across the board. I've used MADI 33-40 for 12Mic 1-4 and 12Mic 5-8 and MADI 41-48 for 12Mic 9-12. I am using MIDI channel 3. I already have 2 X FerroFish Pulse 16 MX in the MADI loop so my first 32 channels are in use. I'm probably missing something obvious, just can't figure it out. Any advice would be much appreciated. Thank you.

Running Mac Sequoia 15.1, TotalMix FX 1.97

Thank you for the suggestion. I have connected the 12Mic directly to the UFX-III (no pulse in the loop) and I'm having the same issue.

I get a "No Response" next to Device, under the Aux Devices screen.

When I first got my 12Mic about a month ago, I was using ADAT and did not realize at that time that controlling the 12Mic in TotalMix FX only works with MADI and does not work with ADAT. So I purchased the REM SFP module and now using MADI Optical.  In theory, this should work now, so not sure what is the problem.

I don't know what that means ? before I had the 12Mic I was using 25 analog Devices that were connected / routed through my 2 Pulse 16 MX. The analog to MADI channel is done in the Pulse 16 device. In Total Mix FX I just renamed the MADI channels to the name of the device ie: LA2A, Neve Pre etc.. don't recall anything about "passthrough"

Thank you Ramses.
I followed the procedures and indeed it was set for 48Khz, so I changed it to 96Khz and the option just above was / is set for 64 channel. Unfortunately, that did not fix the issue. In AUX DEVICES, it still says "no response" next to Device. Now just want to confirm with you, when you say "the rest of the channels, which are NOT for the 12Mic itself, also need to be routed through" do you mean in the 12Mic web interface I have to manually route / assign all the other MADI channels ? Not sure I get it. In Total Mix FX I have MADI 1 to 32 configured as per my Pulse 16MX. In the Pulse 16MX the Analog I/O is routed to corresponding MADI I/O, so when I match that routing in TMFX, I get audio signal flowing through my analog devices. In the 12Mic, I have routed / assigned the 12 mic preamps to MADI 33 to 45 using the web interface, ie: click and drag the preamp to the MADI channel etc. Not sure what else I need to do in the 12Mic web interface ?

Ok Thank you very much, I will try that !!